conception date

[eleb82]

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!

[eleb82]

well, that looked like a regular period, so i guess it was, plus i think that specially on my first ultrasound they would have noticed if i was 2 weeks ahead , right?

[GoBrandiRanger]

If you were 5 days late and tested and it was negative, I'd say you're very lucky and didn't conceive with anyone but your boyfriend. Congrats! :)

[nichole75315]

I read all of this. If the first ultrasound is most accurate and that was May 17 stating 6w 3d I would say that's closer to the March dates? Idk. The numbers are too close in my opinion. My doctor uses my first due date even when I measure ahead now... I'm not a conception genius but I'd be open when thinking. Ask your doctor if you can speak with the head nurse in thier staff...?

[nichole75315]

Also... Seeing that you had sex one week prior to your period I do believe its possible to have a regular period. Your body had most likely already started that process. Don't we release estrogen prior to the release? Really wish Id paid attention in health...

[eleb82]

the ultrasound tech would have seen if i was 2 weeks ahead , right?  6 weeks and 3 days , means 4 weeks and 3 days from conception, cause they add 2 weeks from menstrual period, right?

[eleb82]

i was 5 days late, but then my period came