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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, 4.0 out of 5 based on 31 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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ask
  • Chelsie Mays

    Ok my lmp was on December 22, 2014; my periods are 24 days apart. How do I know when to take a pregnancy test? Every calculator I’ve used, says I’m approximately 2 weeks 5 days. Please help

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  • SALAMATU KAMARA

    I LIKE TO KNOW MORE ABOUT THE PREGANET

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  • Tina Ramirez

    Can I be pregnant still if I did have a period last month on 12/17 however I did has have unprotected sex everyday prior to that including my ovulation day which would have been 12/9, up untill three days before I started that period. It is now the following month and I am a day late but my last sexual eencounter was the three days prior to my last period.. .could I have indeed concieved one of the days I did have sex perhaps my ovulation day 12/9 and still possibly had my period on12/17.? I would be Extatic to be carrying my second bundle of joy but by reading all the negative responses about the period meaning It would be impossible. Someone please help..

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  • nanny

    i had sex on 31st of july 2014. how old will my pregnancy be?

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  • Elizabeth

    So I have my period 17 of Dec.2014 ended the Dec.22 2014 me and husband decided to conceived the 31 of December and now on January 19 I was spotting pink for a day and it stop. Now am wondering can I be pregnett ? And should I make a pregnancy test

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  • Tash

    I had my last menstral 12/19 and took a pregnacy test the day after I missed my period and it was negativ. And all my friends said it may have been too early. Is this true?

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  • Yazmin

    I have a regular cycle last month I got my period twice and I’m two days late. I took a pregnancy test and it was negative. Does that mean I’m not pregnant or that I maybe tested too early?

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  • shanita

    Ok i had a period on the 5th and came off on the 10th is it possible on the 7th if i miss i could be pregnant???

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  • Sharon

    I have a question I had a baby in December and bleed for about two weeks after its now febuary 2 nd and I haven’t had a period should I be worried . Should I test or wait it out

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  • Ashley

    I’m about a month and a half late on my period. I took three preganacy test and they were all negative. I was trying to go to a OBGYN but they don’t have an open appointment until next month and I can’t wait that long to know if I’m pregant. What should I do?

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  • Baby

    I had sex on January 31st on my Ovulation Day, &&’ my last period was January 10, I was pose to get my period on the 7th of feb 2015 &’ it still haven’t came every month my period starts a day late but I’m getting scared because it haven’t showed up. . .

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  • Emily

    Hi I need some advise me and my husband have been trying for a baby I last had a period the 20 th december and I still have not had a period I tested on the 23rd of January it now the 9 th of February should I do another test or wait till I am next due to come on

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  • Francisca

    I just had sex unprotected, but my period starts until the 25 of Feb. Is there any changes I can be pregnant right of way?

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  • stormie mccarty

    I am three days late on my period. I have had a period in january. I been having a lot of back pain bobs are so sore. Feeling nasty in the mornings. I had a miscarried in October. And a period in December and january. Me and my husband have been trying. My ovulation was on February 2nd. And my period was on the 15th. And I missed it. Can you please help me. And if I am pregnant how many weeks will I be. My last period date that I had was January the 15th

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  • Rochelle

    Is it possible to get pregnant 9 or 10 days from the beginning of my last period

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  • Amanda Lutz

    if the first day of my last cycle was December 27 2014 how far along am I

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  • shay

    I got my tubes tied one month i can on forv4day next moth 2day and im spotting early

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  • Jae

    i had my period last month on Jan 3rd then again on Jan 29th 2015 . i was suppose to get my period Feb 26th i missed that ! What do i do ? when do i take a test ?? and a the right results??

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  • mistyb

    I have not had a period since Feb 1st. I’ve taken 2 tests 1 the 25th and 1 today both were negative. Could it be to early? I used frer. Please help!!!

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  • Nicci Todd

    Last month my period came a few days early. I usually start on the 11th every month except last month. Its the 6th and I havent started. Do I wait until the the 11th or could I be pregnant

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  • rose

    my last period was feb 16 when can i check for the pregnancy test.i have the symptoms of headache dysentry,tirdness

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  • shayla

    I had emergency ectopic surgery in august and had one tube removed and was bleeding ever since then up untill feb.15th and having pregnancy symptoms i think…. i took a test 2 days ago and was negative…. could i still be pregnant? Please help…

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  • Jr.

    I gave birth to a beautiful baby boy November 15, 2014. I was 21 weeks and 2 days, he passed away shortly after. I got my period December and January, regular periods. in February I missed my period but lightly bled on and off for a couple days for like two weeks and stopped March I still haven’t got my period. I took one pregnancy test in February and one in March both were negative. I had lower abdomen pain but went away. Can someone please help me?

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  • Hope

    I had 1 fallopian tube removed and other blocked my last period was 2/19/15. I have not took a home test because I was told I could never get pregnant. Could you give me some out look on my concern.

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  • shelby

    Me and my boyfriend has been together for 10 months. And I haven’t started my period this month and there’s only 3 days left

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  • me

    Ovulation kit says that I didn’t ovulate this month and my period is late what could this mean?

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