Endometriosis- abnormal bleeding

I've had endo for about 5 years now, and just recently I've started bleeding with sex. My doctor did a pap and I bled like crazy, but results came out normal.
Has this happened to anyone else?
I don't bleed every time, just when I do certain positions and it doesn't usually hurt when I bleed, it just scares me. It's always bright red and lasts a couple of hours at most.