When did i concieve? im 5 weeks pregnant. my period start date was 10252014 i had sex on 10312014 the 5th & the 8th of november.wh

Probably the 8th?: Well, the 8th of November is day 14 so that would be the most logical guess. But it is a guess. It could have happened on the 5th. As it sounds like you already know, the due date is calculated 40 weeks from the last period: we don't even try to actually nail down the precise date of conception. Congratulations and good luck!

Hard to say: If you have regular 28-30days between periods, I would guess Nov 8 is more likely than the Oct 31. Too many variables to be sure. Best of luck!