During the first week in May, I engaged in unprotected intercourse, however the guy I was with did not ejaculate inside of me. I take birth control daily, however we decided to buy plan B just in case. A week goes by and instead of my scheduled period, I had Brown discharge. I was concerned and took home pregnancy tests. They came back negative. Two weeks after, I got what think was a period. It lasted the normal 4 days. So I really didn't think I could be pregnant. I have not had any sex since that day in May but it is July and I haven't had a cycle in two months. Im concerned that I could be pregnant. Although I am probably just over reacting, it still bothers me. What could be the reason im two months late?