I Noticed That The Last 2 Times I Spotted During

I noticed that the last 2 times i spotted during intercourse. In the previous years i have had 3 D&C done, my tubes were permanently burned 10 years ago after my second c section. I don't feel ill or anything. Just noticed that i bleed twice now while having sex and i am worried of what it might be. My BF had someone before we got together and was tested with a sexual transmitted disease but those results were good. He didn't catch anything. I am still concerned about that, but also my health in thinking its something worse. I do have mentruals more than normal, sometimes it is very heavy, and i get so tired. Need help