my girl friend n i had sex on the 19,20,21. of november.though her cycle starts on the 3 of november ,she had her period on the 16 of nov.she had sex with her husband on the 26 of november.as she was supposed to get her period on the expected date she dint , so she bought a home pregneancy test and the result was positive.she went for an u/s, which as said by the gynic was after 12 weeks that was the 8 of feb,she went to the doc on the 7 of feb because she had to travel on the 8.hence the embreyo being 11 weeks 6 days old.but the guy doing the u/s said the embreyo was 12 weeks 1 day old.now we'r confused as to whose baby it is.i would really appreciate it if you could help me in this aspect