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Ok my lmp was July 28th. The 26th my boyfriend and I got a little drunk, didn't have s_x but (sorry if it's tmi) dry humped and got alittle close if you know what I mean but like I said I was on my period and I had a tampon in. My period ended the 28th and I know we had s_x a couple times after that and then for sure on August 12th but didn't finish and then on the 14th of August. So when do you think I concieved? Im due may 5th and when I went in for my u/s on the 12th of Dec they said I was measuring at 19 weeks and 6 days which was 2 days earlier than what I measured at with my lmp. Sorry for this being so long I just hope that I concieved after Aug 2nd b/c I had to much fun at the end of july if you know what I mean. Please help.