I have irregular pd's every month, my lmp was 7-25 or 7-26. I took 4 home pg tests yesterday and got a fast positive for all. What day did I conceive?

One of the days you had sex between 7/26 and your previous period.

Determining conception dates is an inexact science and cannot be pinpointed any close than that. If you had intercourse with multiple partners during that period any of them could be the father, if that's your concern.


P.S. its not a good idea to piggyback your question on another thread. To avoid confusion your post has been moved to its own thread in an appropriate forum.

Ok I apologize I am totally new to this site I am still navigating through it. Another question how soon can a home pregnancy test read a positive reading?

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Originally Posted by ScottGem

One of the days you had sex between 7/26 and your previous period.

Determining conception dates is an inexact science and cannot be pinpointed any close than that. If you had intercourse with multiple partners during that period any of them could be the father, if that's your concern.


P.S. its not a good idea to piggyback your question on another thread. To avoid confusion your post has been moved to its own thread in an appropriate forum.

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HPT accuracy is less than 50% the first week after you miss a period. It increases to over 95% (when taken according to instructions) by the end of the second week.

Ok. Thanks. I guess a more specific question is if you take a test 10days after intercourse how accurate is the 4 positive home tests?

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Originally Posted by ScottGem

HPT accuracy is less than 50% the first week after you miss a period. It increases to over 95% (when taken according to instructions) by the end of the second week.

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Every woman is different. Every pregnancy is different. There is no way to give you a percentage.

If paternity is in question you will need to have a DNA test done after the baby is born.

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Originally Posted by xxnikkixx

Ok. Thanks. I guess a more specific question is if you take a test 10days after intercourse how accurate is the 4 positive home tests?

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10 days after intercourse is not accurate at all. Until you miss your period taking such a test is ineffectual.

Is it possible to have a positive reading 10 days after intercourse?

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Originally Posted by ScottGem

10 days after intercourse is not accurate at all. Until you miss your period taking such a test is ineffectual.

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Its possible, but I would not consider it proof of pregnancy. The first manifestation that you are pregnant is when you miss your period. Until then a pregnancy cannot be confirmed.

10 days after is a somewhat short time frame, however, it is not impossible. That said, it’s possible to bleed during pregnancy, either in “cycles” or continuously (though it would not be a true period). Since you got 4 positive tests, ask yourself if it’s possible to have already been pregnant in the previous cycle, if your dates are incorrect, or if you have taken the home tests accurately (with first morning urine). The next step should be that you contact a healthcare provider ASAP to confirm pregnancy via blood test. Each woman, and how their bodies process the hcg hormone, is different. I have had seven pregnancies and with all of them, I tested positive between 9-10 days past ovulation.

That was where I was going originally when I started this conversation. My lmp was 7-25 I had intercourse 7-31 through 8\5 and then again on 8\10 when did I most likely conceive? When I did all 4 test it took 30sec to show up and they were powerful positives. Can you help with this?

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Originally Posted by LearningAsIGo

10 days after is a somewhat short time frame, however, it is not impossible. That said, it’s possible to bleed during pregnancy, either in “cycles” or continuously (though it would not be a true period). Since you got 4 positive tests, ask yourself if it’s possible to have already been pregnant in the previous cycle, if your dates are incorrect, or if you have taken the home tests accurately (with first morning urine). The next step should be that you contact a healthcare provider ASAP to confirm pregnancy via blood test. Each woman, and how their bodies process the hcg hormone, is different. I have had seven pregnancies and with all of them, I tested positive between 9-10 days past ovulation.

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Originally Posted by xxnikkixx

That was where I was going originally when I started this conversation. My lmp was 7-25 I had intercourse 7-31 through 8\5 and then again on 8\10 when did I most likely conceive? When I did all 4 test it took 30sec to show up and they were powerful positives. Can you help with this?

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We can't tell you when you conceived. You'd have to know when you ovulated by taking your basal temperature and tracking ovulation for at least 6 months. Even then, we still couldn't tell you the exact date you conceived.

Since we don't know when you ovulated, and each woman is different, there's no way to tell you when pregnancy occurred. It's all a best guess, and can be off 2 weeks either way. You'll have a better idea of how far along you are when you get an ultrasound done, but even an ultrasound will not be able to tell you exactly when you conceived. That's a best guess too.

If this is a matter of paternity, the only answer would be a DNA test after the baby is born.

Good luck.

Honestly, no. The part about each woman's body processing hcg hormone is the key. Because of that, the positive result on a home test is a variable. You might have a strong reaction to pregnancy and produce a high amount of HCG, when another woman might produce a lower amount. The range of "normal" is very wide - anywhere from 6 to 20,000 for example. The other variable is that each brand of HPT is different. Some might show a positive result with a hormone level of 6, others might now show the same result until hormone levels are 100, for example.

The best GUESS as to when you conceived will not be possible until you get an ultrasound (anywhere between 8-12 weeks pregnant) when they measure the baby. That is still not an accurate guess, but it's the closest you will get. If you had sex several weeks apart, that's one thing, but your window of possibilities is too small so even with ultrasound dating, it's still only an educated guess, not a certainty.