When I was on provera recently, the GP explained that it would force a withdrawal bleed. So I had to take it for 14 days, every day. Then 3 days after I stopped taking it, the incredible bleeding started. You know that I ten to bleed for weeks on end as well, and that's actually why I went on the provera. So for 14 days I didn't bleed, and then I bled for about a week after the pills finished - big clots, palm sized It's like a chemical d&c, sometimes it's enough to clear EVERYTHING out so you don't need an actual d&c, y'know?