My doctor put my on medroxyprogesterone because I have irregular periods and my husband and I are trying to conceive. I took one pill and realized the bottle said "DO NOT TAKE IF PREGNANT." That made me a little nervous since I had been trying for over 5 months and I was not sure if I was pregnant, so I thought I would wait until I could contact my doctor a few days later. After that one pill, I started having light brown spotting. This is the 3rd day I have had brown and red spotting... it is thin and I am having a little sciatic nerve pain. Is this from the pill? Would one pill do this?