Have been on depo-provera shot for two months. after sex today i noticed a light pink discharge. what is it?

Spotting: Many women experience spotting after intercourse caused by inflammation of the cervix or you may be having some spotting due to hormonal changes from Depo provera (medroxyprogesterone). It is also possible you have an endocervical polyp, a benign skin tag which protrudes from the cervix and can bleed after intercourse. See your healthcare provider to determine why you are bleeding.