"hello, i have thee most worst experience.... i was on the shot for about 2 years or a little over. the first 2 months of having it, i had serious blood clots and cramps something serious. after about a year in some months, i would only spot 1 wk before getting the shot and 1 wk after. every time i had sex, i will have the worst abdominal pain for like a hour. i ended up getting my last shot 11/2015 and was suppose to return 01/16 never went. after that by march, i had my period for a month in a half. next period was in oct, now on it since jan 15th til now... and extra heavy"