I'm 19 years old. I'm still a virgin. I'm on a birth control that stops my periods for 3 months. I've have been on the pill for awhile. For the past 4 months, I've been on my period for 4 months straight. I'm passing huge blood clots(size of a quarter). I'm having to change my pad every 30 minutes. I don't know what is wrong but it's very annoying.