Hi, 

 I just ended what I thought was my period about a week ago, and yet, yesterday I started bleeding agian. However this time it is black and heavy with a lot of little clots all through it. I have just started taking birth control pills over a month ago. The first period was almost a month late and started out with a big clot in it. There were no cramps what so ever though and only lasted a couple days. This one I have mild cramps. I was wondering if this has happend to anyone else?