I'm due July 6th. Making me 5 weeks 6 days. Had ultrasound to confirm this. Doc puts me at oct 13th conception. Rule of thumb to give or take couple days... making window of 11-15th. I had intercourse on the 16th, and I wanna know if it is at all possible that I got pregnant from that...??? even tho she's putting me around the 13th since that's what ultrasound showed us.