So, I'm 31 weeks from my LMP, but I know when I ovulated, which is exactly 7 days later. Me and baby have been measuring EXACTLY one week ahead since the very beginning. I know this usually doesn't mean anything except I KNOW when I ovulated. Pregnancy is counted 40 weeks from LMP, but 38 weeks from ovulation. Should I mention this to my doctor? I'm worried the week might make a difference if the baby is breech and needs to be turned, etc in which case week 36 is really 37 & then I go into labor.