The first time my boyfriend and I had sex (he wasn't my first) I began to bleed. We do use condoms eveytime. A few weeks later, I noticed during my ovulating cycle I began to bleed after we had sex again. I read on the Internet bleeding occurs with women the age of 20-30 years old and I'm 18. I also read during implantation and fertilization of the sperm and egg together causes slight bleeding towards menastrating, but I'm nowhere near... any thoughts???