Ok so I was told by my nurse today that I'm seven weeks. My so thinks I cheated on him while he was in jail for 2 weeks because they use the first day of my last period. How can I explain to him that I didn't cheat that conception did happen the day he got out of jail but that they count it from the first day of my last period... He seems really confused and continues to say that in only 4 weeks.... I just don't know how else to explain it to him.