So I'm on the depo shot, never get periods but lately I get them an they only last a day. Also after having sex with my boyfriend I bleed sometimes its a lot and other times its not. Or sometimes not at all. I got a pap smear back in aug. everything was normal. But the bleeding still happens... wat is the cause?

This has happened to me once, but I'm not on any shot or anything.
It could be caused because of either how rough your intercourse was or because you had sex after your period and your period wasn't fully over yet.
It happens to a lot of women.

Yes, is the sex rough, does it happen in some positions more than others, do you use a lube.