My boyfriend and I are sixteen years old, we've been together for a year. We both have had no other partners, we lost our virginity to each other. In addition, we've been having protected sex and there had been no problems with any health concerns. I've never had any problems that concluded with pregnancy test or any test alternatives with doctors. However, yesterday (May 1), we had unprotected sex. I had my period from April 27 to April 30, and generally, I have my period for 4-5 days. On this occasion, I thought it was four days.. we had unprotected sex and used the "pull and pray" technique in which he pulls out before he experiences his orgasm. Today (May 2), I've experienced some bleeding.. Is it possible that it is an extension of my period from 4 days to 5 days, or is this something I should be concerned about? Please help me, thanks. :(

More than likely it is from your period... can also be from the intercourse itself.

Do use protection every time you have sex however as there is no 100% safe time. You could tend to ovulate early or may even have an off cycle where you happen to now and then.