Hello everyone! I had an ultrasound and a positive pregnancy test June 29 2013 that day I was told there was only a gestational sac. My due date is Feb 26 2014 and I am 20 weeks and 2 days. I am concerned because I had my period march 21 and had intercourse on April the 4 or 5 but for sure those days. Got back with my boyfriend the day after and found out I was pregnant in June. My doctor said my LMP would have been may 22 but I can't remember a period for April or may I didn't write them down.

Gestational Dating is all Best Guess, so if there is an issue surrounding paternity then a DNA test would be in order after the birth with all concerned parties.

Estimated conception dates are just that, based on size, some people are larger than average, some smaller, so all estimates can be guesses. So it may be possible.