If you have sex on your period and you get pregnant how would you calcuate your due date? Would you use the LMP of that period you had sex on or the previous LMP which was a whole month ago? ↓
They would use the more recent period, but if you suspect you conceived while ovulating during your period you should mention it to them. They may wish to do an ultrasound to try to get a better estimated due date. ↑
