Hi, I had unprotected sex with my partner on the 20th of June. I then made the silly mistake of having unprotected sex with my friend on the 22nd of June, then again with my partner on the 24th of June. I took the morning after pill on the 25th of June. My periods work like clockwork and I was due for my next one yesterday, the 8th of July. When it didn't come, I took a home pregnancy test and it came up positive. I went straight to a doctor and gave them the date of my last period, which was the 10th of June, which they then used to calculate an estimated due date - March 17th, 2014. Is it possible that the pill didn't work and could have fallen pregnant to my friend? Or would it be most likely that I fell pregnant BEFORE having sex with my friend? Please help!