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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 27 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

Related posts:

  1. Ovulation Calculator: Free Fertility Calculator
  2. How to Read a Pregnancy Test: 3 Best Tips
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  • BB

    My Menstrual cycle has been on average 35 days for the last two cycles, I think I was ovulating 19 – 22 July, a Nurse carried out an early pregnancy test today so that I could have an xray, it came back negative but I think that it was too soon for an accurate result, am i right?

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  • BB

    Sorry, I forgot, the first day of my last period was June 28

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  • NICOLE FLOWERS

    HELLO MY PEROID HASNT CAME ON THIS MONTH BUT MY LAST CYCLE WAS 6-7-13 AND I TOOK A TEST WED. AND IT WAS POSITIVE CAN IT BE TRUE.

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  • sykemia

    i havent had my cycle since 6/26/13 and it hasnt came yet could i be pregnant and when should i take a test

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  • monica

    I got my piriod super late last month on the 30 today is 31 and I have not got it is it to early to do a pregnecy test from the store

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  • Ss

    My last period was on June 28th& I have 30 days menstural cycle from the day 1 of my period..today is 5th aug & I have still not got my periods. Can someone pls advice if I can take the home pregnancy test or is it too early to go with that( today is 39 days from the day 1 of my period).. I don’t have nausea, giddiness& food craving.. My breast is tender but usually it gets tender before my period cycle.. So me extremly confused if this is due to pregnancy or my regular period cramps.. Pls clarify if its right time to do the test???

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  • kimi

    Hi, I’m 4 days late and preg tests are a new

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  • kimi

    Sorry i ment a negative – kimi

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  • ashiely jones

    My last period was July 24th. I haven’t had my period yet and my vagina is extremely wet. Is that an early sign of pregnancy? My falls have also been swollen.

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  • Maureen Stephens, RN

    If you are suspecting that you are pregnant, it is best to take the pregnancy test two weeks after you miss your period for a more reliable result.

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  • Ilse

    Hi, I did the period calculator my last period was july 20 2013 and according to the calculator I should’ve gotten it on the 17th of this month I been having cramps for 2 weeks now and my discharge became from little to nothing I took a pregnancy test this past Friday and it came back negative. What can it be? or could the period calculator not be accurate?

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  • Dr. Renee Hanton, MD

    Heavy vaginal discharge can be one of an early sign of pregnancy. The earliest time you can take a pregnancy test is two weeks after you miss your period for a reliable result.

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  • Amber

    I had my period the 25th of July and took a test the 28th of August and it is positive so my question is when did I concieve the 4th or the 11th when I had sex

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  • angelie ore

    i am 21 weeks and 5 days pregnant now my last period is april 12 to april 24.. i was curios about who is the father of my baby.. i have sex my ex boyfriend on march 29 and my boyfriend right now is 1st week of april. can you help me. thanks

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  • going crazy

    i started my period a week early this month. it seemed a lil heavy for ib but was light for my norm. we had sex either while i was ovulateor pretty close to it. my chest has been hurting and not been feeling well. i am 24 if that any. my question is could it have been ib or period and if ib when would b a good time to test? o and not only was the bleeding early it was short 2 days normally i go 3-4 and like i said light for me i only used 1 pad the first day and it didn’t even fill sorry tmi

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  • cj zamora

    I had unprotected intercourse on three of my fettile days now I am three days away from my period I’ve been having cramps bloting and pavk pain in the lad two weeks and noe I have sore and heavy feeling Brest could I be pregnant?

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  • pwincess

    Plz help me n thank u so much

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  • pwincess

    I started my period of 27th august and iv checked my pregnancy test today on 1st october and it say negative when do a take the test again plz help me

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  • John James

    Hi Doc, My wife has regular cycle of exactly 28 days and since we are anxious and did not see any sign of periods, we did test it on 29th day itself, (we did the test using evening urine) but the result was clear negative, now it is her 31st day and still no signs of period, what should we expect now..? Please help us out…

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  • saba

    Hi I had my last periods in last month date 02/09/2013 and on this I did not get any periods the date is 06/10/2013 Im supposed to start my periods on 2nd but still no signs of periods help me please am I pregnat do I need to get my pergnat test done and when? Thanks

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  • Dr. Prabha Sahgal, MD

    The earliest time you can take a home pregnancy test is two weeks after your missed period or you can visit your doctor and take a blood test one week after your missed period. When taking the home pregnancy test, do it first thing in the morning as your morning urine contains the highest concentration of the pregnancy hormone (hCG).

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  • Dr. Prabha Sahgal, MD

    The earliest time you can take a pregnancy test is two weeks after your wife misses her period. It is best that she takes it first thing in the morning for a more reliable result.

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  • Ladi j

    On November 21 was the first and last day of my period and we are in a new month of December and on the fourth of a Wednesday of this month I spotted pinkish night. That would last like a Sengleman no more than five minutes and after that I’ve been having with symptoms back achy body aches and this ten-day bloated

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  • tasha32321

    hello I am 23. I usually have a regular cycle (28 days). however its 30th day today and I haven’t had my period yet. Aside from missed period, I haven’t had felt other signs. I had used EC two week ago. what could be the reason? Am I pregnant or this is just a side effect of use of EC.

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  • ashley

    i dont know my cycle lenghth i had my period 12-2-13 but i havent uet had it am i pregnant or just maybe late???

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  • patricia rios

    My last period was December 3,2013..its January 4,2014 could I b pregnant

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  • Amanda Lynn Rodriguez

    I had a miscarriage back in May of last year my fiance and I have been trying to have a baby since then my periods have been regular but last month I did not get my period and now I am 8 days late I have all the symptoms of being pregnant for all the testing is coming out and saying negative what should I do

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  • sondra

    on jan14,2013 i had an etopic pregnancy the baby was removed and some of the tube is it possible for me to be pregnant now i havent seen my period in a month and going on two weeks i have taken four test all reading negative

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  • Michelle

    I haven’t had my period since about the end of November 2013, I usually get it around the end of the month. So I have taken 3 test 1 was inconclusive and 2 negative. I still have not got my period. Does this mean I might to have blood work done?

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  • Joy

    My last period was on March 26,2014. I have been having lower back pain, tightening cramping in abs. I took two tests both negative. Is it too soon to tell? Drs want to give me a ct scan and say I’m not pg but I wonder if it’s not too early to tell and don’t want to risk the baby’s health. Thx

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  • cherelle brown

    I haven’t had a period in almost 3 months when this month is over . All test said negative . Its been regular. Is it not showing yet for a reason . Because the same thing happened in my first pregnancy but didn’t have any symptoms or anything til I found out I was pregnant.

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  • chariot

    Hello the first day of my last period was April 30 2014 and it ended may 6 my estimated next period would have been may 27 I am in the mirena iud and have pregnancy like symptoms took 3 at home pregnancy tests all came up negative I have a doc appointment tomorrow for a urine test and blood test I’ve never been late before unless I was pregnant

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  • Jeny

    My least period was May 11 (first day) ,my cycle is 30 days, today is Jun 14 ,but no period yet. I tested my self on Jun 14 , results , negative ???? So why I haven’t started my period

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  • leena

    now am trying for second baby .i am sexually active on june 14,15 and 17. my lmp is june 3. on july 1 i take a pregnancy test and it shows negative. is any chance to be positive result. when we know the correct result.

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  • Wendy

    I had my last mestrual on 6/5/14 and had unprotected sex on the 14,18, and 21 . My cycles are normal (28). For the past two weeks I been feeling really exhausted ,abdominal bloating , moody, abdominal cramping, and a white milky discharge. I took pregnancy test, they were negative. Could I be pregnat? When is the right time to test?

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  • Sophia Thomas

    Im 32 my tubes were tied for 8 years,my last period was june 13,2014 ,its now july 24 my period neva came on Im very nauseous n lower back pain I took a pregnancy test sunday pass it was negative,did u do it to soon I need answers cause this isnt normal for me

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  • Christy

    I had my period this month but only bleed for two days then spotted for two days am i pg I took a testa week ago and it was negative

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  • michelle

    ok i start my period september 6 it takes only 1 day after that its stop few days after i am spotting for nearly 2 weeks now what is it means?

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  • Shannon

    My periods are from 28 days to 33 days from one to the next how can I tell if I ovulate on the days It shows

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  • Shannon

    Better way of asking ! Ok my last period was on August 25.2014 I have been trying to have a baby but not sure when my next period is gonna come my periods are any where from 28 to 33 days so I’m not sure when it’s supp to start or when to take a test if it helps I know I had a positive ovulation test on the 11 th of September and I did the deed the day before and the day of

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  • Danielle Davis

    I did a home insemination on my highest peak day 9/17 i had some cramping on 9/29 and a couple spots. No period. took a test 10/7 was negative but have dry skin and naseau and some smells will send me to the toliet how soon should i retest?

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  • hanan

    Hi. First day my period was 09/20/14. End 09/22/14. Today. It is 10/18/14 normal. Every month. 22 days. And. Now. It’s late. 2 days. So. Can I take. Pregnat. Test.

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