okay, I'm 17 years old. I do have sex with my boyfriend but not often. I have had irregular periods since I have had a period. all of a sudden I had a very light period that lasted for 5 days. then a week later I began spotting which turned into a period which lasted longer than 7 days. I've been off for a week. When I went to the restroom and wiped there was a little bit of blood. I am really really worried and I don't know why this keeps happening to me. please help.