Ok ladies so my period was 12/14 and so im irregular and 1/8 i had a period i had intercourse on Christmas and again dec 29,30 and again on my birthday 1/4. My Specialist says my baby is a week and 2 days behind and im 3 days behind. My ob is goin by my last period 12/14 instead of 1/8. So if she going by that date wouldnt this make me due in the end of September instead of October. The original date i was given is 10/4 just doesnt seem right to me what do you ladies think or du they add on 2 weeks. Jus curious