i am 23 years old, i am 5'2, and about 125 lbs. i am not allergic to anything, never had surgery, and dont have a history of STD's.i have been using depo provera shot since december of 2009. after having sex with my boyfriend i always start bleeding and then i spot for a few days.before using the shot i never used to bleed. when getting my pap smear done this year i asked the physician why i had the bleeding and she said she doesnt know. could this be caused by cervical erosion?