I've been on my period for 3 weeks and I've been through 3 boxes of shipper plus tampons. Every time I change, huge clots of blood come out. It's been heavy bleeding since the beginning and now over started having horrible headaches and I think it may be because I've been bleeding so much for so long. This is my first month on the pill, but I feel like it's not working and I don't know what to do.