Can pregnancy occur before an ultrasound LMP?
Could I have gotten pregnant before my ultrasound LMP? I had a one night stand on February first, then had my period February 5, and it ended on the eleventh. I have normal periods. I got back with my boyfriend and we were together on February twelfth and eighteenth. On my ultrasound, it puts my LMP as the fifth, and that makes my conception date roughly the nineteenth. However, the one night stand has come out of the woodwork and started demanding a paternity test. If my child was his, would the LMP go back to January 18? How worried should I be?