So I've been on the pill for less then a year - I was placed on because of terrible pains around my period week and heavy bleeding that use to put me in hospital. Anyway I've change pill 3 times in less then a year and my new pill has been causing periods twice a month, some nice and normal. and the odd one which is heavy painful and black. I'm heathly and sexuaily active with my bf for over 1 year and a half, is this something to worry about - it usually goes away after a week - like a normal period but is back every month or second month with an extra period a week after the last. Someone please help, I'm young, scared and annoyed