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conception date

hello,
i need some help estabilishing a more accurate conception date.
i had sex with a man around the end of march, like march 25 or 26 , he did not come inside of me, we ended up finishing with oral sex, thats how he came.
then my period came a little late, like 5 days late, and also found out through a ultrasound i had an ovarian cyst. (that went away with my period though.)
just to be sure, i took pregnancy tests and they were all negative then.
so my period came around april 3rd, and lasted like 4 days, like it has always been though.
then around april 9 i had oral sex, no penetration at all.
from april 13th on i started having unprotected sex with my boyfriend .
on may 17th i found out i was pregnant, and the same day i had an ultrasound that was stating i was 6 weeks and 3 days pregnant and the due date was january 7th ,2013.
the other ultrasounds i had were stating that my due date was on january 10th, ( morphologic ultrasound i had at 20 weeks, and a 3d one that i had at 25 weeks)
i need to know when i have conceived. my doctor says sometimes around april 16th.
i need to know if there is a chance that i got pregnant , maybe with pre ejaculation sperm, at the end of march,and maybe what i thought it was my period, was only implantation blood?
if so, though, all the ultrasounds i had should have stated that i was 2 weeks ahead, right? please answer me, im very anxious!
Best Answer
Avatar universal
Nichole, when counting back 6 weeks 3days from may 17 you only count back 4 weeks 3 days and that would be conception date. Which is April 16, exactly as her doc said.
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Early ultrasounds are most accurate
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i just needed to know for sure the conception wasnt at the end of march, cause reading stuff online you learn about implantation bleeding, and i started thinking maybe it couldve happened to me. my periods are never regular though, and i guess since i had the ovarian cyst and i was very stressed out then, thats what caused my period to be late.
the march guy also says that he is been told by a doctor that he cannot have kids, cause his sperm is not strong enough, but still..i need to be sure.
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Avatar universal
well, anytime starting from april 13th im safe, cause i know its my boyfriend's baby !    the ultrasound tech looks at the baby measurements and see if they matches with my last menstrual period?
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Haha I figured I thought I would help clear that up a bit. :)
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thanks, actually Nichole scared me a little..;-(
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Avatar universal
We posted at the same time, but yes eleb82
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