I have been bleeding for 21 days so far, before this the dr would have to put me on provera to have a mentral cycle I rarely ever have one and when i do its just spotting I have been trying to get pregnant for the last 3 years now and so far no luck I have done several test and now the dr has me on 1500 metformin this is the 1st period I have had since on the metformin they started me off on half the dose im on m=now and I had no luck, Im just curious with what going on with me I have called the dr and they say everything is fine but did schedule me for a ultra sound of my uterus but thy said i have to quit bleeding before they can do it so i guess my question is 1st whats causeing this and 2nd will it stop