Provera and Biopsy help

I'm taking Provera cause I have PCOS and today I'm supost to take my last pill to complete the 10 days to get my period and yesterday I had a biopsy and just now I realize when I go to the bathroom that I'm bleeding like a period with really bad pain I don't know if is that I get my period or if is something wrong about the biopsy cause that was awful any help please