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Pregnancy Test Calculator

on Jul 04, 2012

by Lucy Eades

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The ultimate test question - when do I take a pregnancy test? For us pee-on-a-stick (POAS) addicts, we need to know because we want to pee on a stick a lot.

The ultimate test question-when do we take a pregnancy test? Now some of us that are new to the trying to conceive world are just kind of like-seriously, when do I take a test? I have no idea. And then some of us other pee-on-a-stick (POAS) addicts like myself just get a little antsy and we want to pee on a stick a lot. We want to know the moment we can find out if we’re pregnant or not, and we likely do not want to wait until we have a missed period! And pregnancy tests are not always cheap so if y’all like saving money, like myself and you’re a pee-on-a-stick addict-it’s a hard equation to figure out if, it really is. Claim Your 20 Free Pregnancy Tests – Click Here

Having a pregnancy test calculator can really ease the confusion or just kind of put things in perspective for you, so you know when you can take a pregnancy test & expect the HCG levels to be high enough to show a possible pregnancy. No sense in wasting good pregnancy tests if it’s too early to test.

Step #1 – Calculate cycle day 1

Now, in order to use a pregnancy test calculator there are only a few things you need to know and the first one is when did you start your period. This will be Cycle Day 1, the first day of your period.

Step #2 – Calculate your cycle length

Next you will need to know your average cycle length, and what that means is how long until your next period starts. Do you usually have a period every 28 days, which is the average, or do you have slightly longer cycles that run 32 or 34 days. So from day one of your period starting up until when your next cycle starts, this will determine your average cycle length. It will typically be between 28 to 32 days for most women, but some women have shorter cycles and some have far longer. Every woman is different.

Step #3 – Calculate the day you ovulated

Now number three is a bonus, an optional point to know. It’s not a necessity that if you happen to know what day you ovulated on or close to in general what day you typically ovulated on, it is a bonus. It will more than likely give you a more accurate result for when to take your pregnancy test, because pregnancy tests are based on the number of days past ovulation (DPO) that you are. If you know the day you ovulated by taking an ovulation predictor kit (OPK) or by charting your temperatures, that will make the calculator results more accurate for you. But don’t fret. If you don’t know the exact day you ovulated, then the calculator will take the average of your cycle length. So if you have an average cycle length of 28 days, it will assume you ovulated on day 14.

Step #4 – Calculate your luteal phase length

Now the next question. What is your luteal phase length? This is an optional question, as the average woman’s luteal phase is 14 days. The luteal phase is from the time you ovulated to the start of your next cycle. Since you ovulate roughly mid-way through your cycle length, and if you have a 28 day cycle, that would mean you would ovulate on day 14. So with a 28 day cycle, 28-14 = 14 days for your luteal phase length. Again, this is only if you know your personal luteal phase length. You can leave this one at the average of 14.

Where can I find one?

Where can you find a pregnancy test calculator? Go ahead and enter in your information above, and find out when you can begin testing. It’s pretty easy. All you have to do is plug in your information, click enter and then you get results. And voila, you know exactly when you can test and expect to find a positive result if you are indeed testing. No sense testing too early, getting a possible false negative, when in fact you are pregnant & it’s just too early to test.

An example result

Okay, so let me give you an example. When I did the pregnancy test calculator, I plugged in June 3, that is when my last cycle started and my average cycle length is 31 days, and my LP which is my luteal phase is sixteen days. I didn’t know exactly when I ovulated, so I just clicked ‘Not sure when I ovulated.’ My results showed that the very best day to test is July 4, with a testing window from July 1-6. Before July 1, it shows that it’s too early to test. And if I did test then, I might end up with a negative that could become positive as the HCG levels rise and more days pass. So it’s best to wait until just the right time to test, to make sure you’re getting just the right result!

So until next time ladies, I will see you all later, bye!

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Pregnancy Test Calculator, 4.2 out of 5 based on 18 ratings

Lucy is a mother of three, who’s passionate about all things AP parenting. When she’s not busy giving tips on keeping babies healthy & happy, you can find her blogging on her popular YouTube channel

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  2. How to Read a Pregnancy Test: 3 Best Tips
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34 Responses to “Pregnancy Test Calculator”

  1. Summerj says:

    Dang girl get your crooked eyes fixed look a little crazy!

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  2. amy nevins says:

    ok i stoped my peiord and its been two months scence i started it. I took 3 at home test and they all came out positive then iwent to the er to make sure that everything was right and he said i was pregnet then i took another test at home to make sure again but it said neitive then we went back to the er and they told me i had a misscarrige after i had takein a blood test they said my peiord should start in a week but its been another month scence i started it so i went to my reguler doc she said i had thyroid problums and then shegave me medication but latly iv taken the medication and i feel sick when i take it and i havent yet started my peiord what should i do please

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  3. Monica Scott, RN says:

    If you are hypothyroid or hyperthyroid, then you must stay on thyroid medicines to bring your thyroid levels to normal in order to assist you in sustaining a pregnancy. As with any prescription medication, there are often many side effects – for thyroid dysfunction, one of which is an irregular menstrual period. Be sure to discuss these with your healthcare provider, to make sure that your thyroid treatment is the best for you.

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  4. April says:

    I’ve been on conceiveeasy almost a month now. I’m 19 dpo with lots of symptoms. Late for AF. Tested many times and all have been negative. Any hope for me?

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  5. Prabha Sahgal says:

    Pregnancy tests may give you a negative result for a variety of reasons: testing too early, a faulty test, or if you are not pregnant. However, if you still have not yet begun your period, you may try testing again in 48 hours. If still unsure at that time, you may want to go to your healthcare provider and ask for a blood test.

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  6. Dr. Prabha Sahgal, MD says:

    Pregnancy tests may give you a negative result for a variety of reasons: testing too early, a faulty test, or if you are not pregnant. However, if you still have not yet begun your period, you may try testing again in 48 hours. If still unsure at that time, you may want to go to your healthcare provider and ask for a blood test.

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  7. yazmin221 says:

    I was half way threw month 2 when I tested positive! I am now 10 weeks pregnant! I hope it works for you too! God bless!

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  8. liz says:

    wow, congradulations!! i just ordered mine today. i hope for a big fat + soon too!

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  9. Monica Scott, RN says:

    I recommend you take a pregnancy test now. Most early result pregnancy tests (EPTs) will detect even the slightest amount of hCG in your urine stream (usually as low as 5mlU/L). In plain English, that means you can get a positive test result at about 7 days after ovulation (egg implantion typically occurs between 7-10 days after you ovulate). Best of luck to you!

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  10. AlishaMarie says:

    do i stop taking fertibella after i get pregnant or do i keep taking the pills

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  11. Monica Scott, RN says:

    If you find out that you are pregnant, then you can discontinue use of FertiBella Advanced Conception and switch to taking prenatal vitamins to give your body all the vitamins and minerals it needs while pregnant.

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  12. Mariahstoots says:

    hi me & my husband are trying to get me pregnant we started on the 22 and its the 1st how long well it take to know if im pregnant or not ?? is it to early to check ?please and thanks

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  13. diannagullett1975 says:

    I think i got an “evap” line )= not for sure been on this medication for 18 days now!! Baby dust to all!!

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  14. desireasweetwater says:

    You look at stuff on line all the time and you think no this stuff cannot be for real. You place the order thinking still this stuff might not work. You take it ever day without fail and what did I find, it worked!! My chest started to hurt first and really was thinking I was going to start my cycle soon. Not the case at all. I took a test after one week of my missed cycle. Positive reading on the pregnancy test!! I even called the company to make sure I was reading the test right and the tests was working correctly!! Sure enough it was correct!! I then called my OB to have another test done. And yes it was true I am pregnant!! Could not believe it!! I am a believer now!!

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  15. Dr. Prabha Sahgal, MD says:

    The best time to determine if you are pregnant or not is on the day after your period should have started. After a missed period, this would be the best time to take a pregnancy test for there is usually an enough amount of human chorionic gonadotropin (HCG) hormone present, which is the hormone produce by the developing placenta after conception, for the test to detect and therefore give more accurate results. Aside from a missed period, early pregnancy signs like implantation bleeding, breast tenderness, nausea, food cravings, etc., may start showing during this time.

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  16. Meshun Smith says:

    ok im confussed i dont kow if im late and should take a test or not my last cycle was dec2,nov 8,oct7,sept,2,aug1,and i thnk july 2…my brest are sore but im thinking that its just pms and its comeing i entered my info in certain web sites and some say its late some say no im confused

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  17. Dr. Christine Lee, MD says:

     Ovulation occurs, 10-14 days after the first day of your period. It would be best if you took a home pregnancy test or better yet, visit your doctor and have a blood test.

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  18. LissaLove says:

    I missed my period last month and I hope I am not pregnant but how can I be sure?

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  19. Dr. Prabha Sahgal, MD says:

    You can take a home pregnancy test to be sure if you are pregnant or not. It is best to do it first thing in the morning as your early morning urine contains the highest concentration of hcg (the pregnancy hormone) You can also check yourself for pregnancy symptoms like breast tenderness, frequent urination and nausea.

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  20. TCochran2013 says:

    I had my tubes tied 1 year ago and I’m 3 days late for my period and I’m not ever late could I be pregnant

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  21. Guest voilet says:

    i was 1month pregnant in july 27,2012 when did i get pregnant?

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  22. Supermodel0810 says:

    I had my period on 2/5-2/8 and had unprotected sex on 2/9. the next day I took next choice and on 2/15 I had sex but this time the condom broke but he didn’t finish inside of me and on 2/18 and 19 I had some spotting but not enough to fill up a pad and now its 3/9 and no period. can I still be pregnant and I took a pregnancy test on 3/6 and it was negative please help

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  23. Quitrice says:

    I had a miscarriage in December had my first period 01-22-2013 and the last one on 2-14-2013 they are about 21 days apart but it haven’t came on yet and I had a false pregnancy test what do I do next?

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  24. Maureen Stephens, RN says:

    A tubal ligation is approximately 99% effective in the first year following the procedure. In the following years the effectiveness may be reduced slightly since the fallopian tubes can, in some cases, reform or reconnect which can cause unwanted pregnancy. You may try taking a pregnancy test and consult with your doctor.

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  25. Dr. Renee Hanton, MD says:

    Given that you were 4 weeks pregnant in July 27, 2012; your probable conception date can range from July 1 to July 9, 2012. I do recommend you to see your personal Gynecologist for you to determine your exact date of conception.

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  26. Dr. Prabha Sahgal, MD says:

    Since you recently had a miscarriage, there is a good chance for you to be pregnant. It is best that you take another pregnancy test 14 days after the first day you missed your period for a more reliable result.

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  27. Dr. Renee Hanton, MD says:

    There is good chance for you to be pregnant since you had unprotected sex on your ovulation cycle. Your blood discharges may already be due to your implantation bleeding. You should try to take another pregnancy test 14 days after the first day you missed your period for a reliable result.

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  28. ashley0417 says:

    Ive had unprotected sex 4/8 and 4/10,4/11,4/14,4/17 me and my husband are trying to have a baby when will i be able to know if im pregnant or can i be pregnant but i dont have any pregnancy symptoms at all and i had my iud removed 3/18

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  29. momo says:

    hi, i just had a baby, 5 months old. my lmp came on the 5/3/2013 and we had unprotected sex frm the 13th up until abt the 20th, we used the withdrawal mode of cont. and now my period is far late, i tested before but the results were invalid, could i be pregnant?

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  30. hisonly says:

    we are trying for a baby and hit all ovulation days plus a few before and after. i had 2 days of spotting around time of period and nothing since. i am now 14 days late and had a negative test today could it still be to early?

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  31. Dr. Renee Hanton, MD says:

    There is a good chance for you to get pregnant, if you timely had sex on your fertile days which is 4 to 5 days before your ovulation date. For you to determine if you’re pregnant or not, it is best that you take a home pregnancy test 14 days after the first day you missed your period for a consistent result. Additionally, pregnancy symptoms start to show as early as a few days after ovulation.

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  32. Jennifer Whittle says:

    I have been TTC for the past 3 years and so far nothing not even a scare. My periods are always irregular. I went to the doctor and he said everything is fine. This month April 2013 I have not had a period yet, I have no symptoms to give me some sort of idea if my period is coming. I have been tired lately not sure if its due to that or because I work. There are only 2 more days left in this month and not sure if I should get excited and take a test or wait even longer and see if my period decides to show up. I have been trying not to think about it but everyone in my husbands family is pregnant or just recently had a baby , I am having BABY FEVER big time. Pls help me and give me some insight on what I should do. TIA

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  33. Dr. Renee Hanton, MD says:

    Yes; you most likely are pregnant, knowing that you had unprotected sex during your fertile window. Additionally, the withdrawal method is not 100% effective, and might as well get you pregnant. Taking a pregnancy test to early might give you inaccurate results, thus; you should try to take another pregnancy test for a consistent result.

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  34. Dr. Renee Hanton, MD says:

    Given that you regularly had sex during your ovulation period, you most likely are pregnant. Your spotting may be due to your implantation bleeding, and your missed menstrual periods may just simply indicate that you’re conceiving. It is best that you immediately take another home pregnancy test; it is important that you carefully follow the instructions for a reliable result.

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