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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, 3.7 out of 5 based on 37 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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  • Tabitha

    My last period started on 20th of October 2015 I had my daughter on the first of the year and I haven’t missed my period since I started having them 2 months post pregnancy. They have hoped around the month though and one month I had two periods. I don’t want to test and it come up negative I would get really sad and I am nervous as well. Should I test or could it just be in my head like always.

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  • k

    My period was november 12-16… However i had unprotected sex on the 27th.. Could i be pregnant?

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  • Ashley

    Hi I’m 7 days late now but on the 4th day I spotted only when I wiped now I don’t know when to test there has been no other blood or even the usual monthly symptoms that I normal get.

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  • stephanie

    Hello me and my boyfriend are trying to make a baby, but we don’t know when we can try unprotected sex. I started my period dec 1st 2015. my period only lasts for five days. Please help! I must have an answer.

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  • jeffrey

    I would like to know if we have sex today and the lady get pregnant,if we use pregnant test it count from that day we were meet?

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  • Celeste

    Okay my last period started on Nov 15 .. I had unprotected sex 3 times on December 2nd.. I’m kinda scared could I be pregnant?

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  • samuel gatua

    i had sex on 18nov 2015 and my girlfreind missed period on 10th this month. she told me that she feel she is pregant. can this be true

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  • Leslie

    I had may period on the 3rd and ended on the 8th I had unprotected sex on the 12th but he pulled out and then the next day he finished inside me my cycles vary 26 to 28 days is it possible for me to get pregnant??

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  • Melissa Lozano

    Hi I had my IUD removed December 9th 2015 I had unprotected sex on the 8th of December and also the 10th of December and so on I had what I thought was a period that started on the 10th and lasted until the 15th I have a lot of pregnancy symptoms I have 3 other kids so I know how it feels to be pregnant I have the nausea headaches body sore I’m eating a lot and stomach starting to feel hard and looks like it’s getting a little bloated I take a pregnancy test today which is the 21st and it said negative just want to know is it too early can I still be pregnant I’m really trying to come see you and it’s driving me nuts I really want to know if I’m pregnant or not

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  • Fld01

    Had my tubes burnt in 8 months ago. Had sex on ovulation day and had some spotting 3 days later. Now I have missed my period can I be pregnant?

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  • amyt12

    I spotted in October and haven’t had a period since. Well I took a preg. Test and it took about 10 mins for it to come back negative but I had a lot to drink before I took the test.

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  • Brit

    I conceived the day I got my period is there still possibility of me getting pregnant and if so when should I test ?

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  • Erica

    The first day of my period was December 4. We have been having lots of unprotected sex all month. I’m not sure how long my cycle is. I tested last week and came up negative but I still haven’t had my period.Help please.

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  • Tiff Linderman

    I have a question I had my tubes tide 3 years now an I have signs of pregnancy would I pass a pregnancy test if I am pregnant.

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  • Tiff Linderman

    I have a question I had my tubes tide 3 years now an I have signs of pregnancy would I pass a pregnancy test if I am pregnant.

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  • Kath Pinkston

    question last yr on dec. 02 is my last period and i got vomit twice and my stomach is getting big and then i get PT its negative and then i got my period on dec. 30 till jan 02 but then my weight its getting 105.0 already and my stomach its still the same and my husband touch my belly its hard and i go get again PT its still neg. did i do something wrong or should i go to the doctor…. plz response thank u can anyone plz tell me

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  • sasmita dash

    i missed my period 28th december, i took home test and they all cam out positive, i also consult a doctor, but i dont know my pregnancy month, can you tell me which month is this of my pregnancy

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  • Nana abena

    I think am pregnant since i realized some symptoms of swollen breast and craving. But i still have my period for the past 2 months now.does it mean i am pregnant

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  • martishaw

    Last period was Dec 4 2015..I missed ly period for Jan 1st…could I be pregnant plus had spotting

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  • Afreeman

    i had a period on 12/5 and then another on 12/22 which is not normal but I did stop taking BC since we want to try for a baby..when do you think I should take a HPT??

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  • Samantha Taggart

    I stopped birth control than had 2 periods last period started 12/10/15 and took 2 pregnancy test and they was negative is it possible that I got a false negative or could there be another reason I haven’t started my period

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  • Whitney Johnson

    If I miss my period and November and in December and in January and today I took a pregnancy test it said positive what they mean can you tell me my last period was November the 13 2015

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  • LadinaAnd Jamario Dangerfield

    Am I pregnant? I came down December 29,2015..My period wasn’t heavy like usual. So now I’ve came down January 20, 2016 and bleeding only 3 days. I don’t know what’s going on. I feel dizzy, tired, and hungry all the time. I usually don’t feel like this. My lower back and lower stomach hurts.

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  • pamela

    my last period started December 30 and it leads on to the next month for 4-5 days and it is febuary I thought I wouldv started lastnight or the day before but I havent

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  • Anonymous

    I tested it today but it came negative
    The calculator shows best time 5th of February should I wait till tomorrow

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  • Danielle

    I had 2 periods in the month of December. The first one started on the 1st and the second one started on the 26th but only lasted 4 days. I know that I am pregnant but I don’t know which period to use to determine how far along I am. Advice needed please…

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