I'm 17 years old. I had started my period about 3 weeks ago, my periods usually last 2-5 days. I am on birth control and this has never happened to me before. It started out as a normal period, now it seems to get light then heavy. I am in extreme pain. It hurts to even get up in the morning just to use the rest room. I go through anywhere from 2-6 tampons a day. I'm extremely worried. I've told my step mom and dad and they told me it was normal. Help any one?