bright red bleeding after sex

[ant86.livejournal.com]

Since the beginning of the year, I have been experiencing bleeding during and after sex.  It's usually bright red in color and occurs every time we have sex.  My question is, why is this happening?  I've been tested for chlamydia and gonorrhea and both came back negative.  My last pap smear came back normal, even though my pap in October was abnormal and led me to have a biopsy.  Has anyone else experienced the same thing?  I don't know what's wrong with me.

*edit* I am currently on Loestrin 24.  Since October I have been on that & Yaz.