Ok here goes. I have PCOD. I had a normal period for about 2 years after I started my period for the 1st time. Then I stopped having periods all together and had to take Progesterone or BCPills. I was treated for infertility in 1998 and have twin boys who are now 4. I got off the pill 2 months ago. Last month I had some spotting which I never have any kind of bleeding w/o meds. I had a Progesterone shot at the end of the month and then had bleeding when I should. This Saturday would have been day 14 of my so called cycle, I had intercourse on Friday and Saturday both and yesterday I started having light spotting. Today it is much darker almost black and heavier. Do you think it could be implantation bleeding?