What Causes Vaginal Bleeding After Having Sexual Intercourse?

HI
I HAVE BEEN TAKING VITEX AND ONE LOW DOSE ASPIRIN EVERY DAY FOR 2 MONTHS EXCEPT FOR WHEN I AM ON MY PERIOD. NOW IT SEEMS AS IF EVERYTIME I HAVE SEX WITH MY HUSBAND, I BLEED BRIGHT RED WATERY BLOOD THAT I NOTICE AFTER WE ARE FINISHED. THE BLEEDING GOES AWAY AFTER SEX BUT THIS HAS NEVER HAPPENED SO I DON'T KNOW IF IT IS DUE TO THE VITEX AND ASPIRIN OR SOME OTHER PROBLEM. I AM 29 YEARS OLD AND I WAS DIAGNOSED WITH PCOS WHEN I WAS ABOUT 20 OR 21. IM TAKING THE VITEX TO REGULATE MY CYCLES AND THE ASPIRIN TO THIN OUT MY CLOTTY PERIODS. I AM 5'7 AND ABOUT 200LBS. THE PCOS MAKES IT KINDA HARD TO LOOSE WEIGHT UNLESS I DO STRENUOUS EXCERCISES EVERYDAY.

THANKS FOR YOUR TIME
LATOYA