In January I had a miscarriage and a D&C done. Right after the miscarriage I didn't really bleed the first two days and then the third day I bled heavily for about a week. Then I didn't have a period for almost 7 months and now I've had a period off and on for two months, not too heavy changing my pad once a day but have blood clots bigger then quarters and I'll stop for about two hours and then I'll get a blood clot and bleed for awhile and it will start all over. What could going on with me?