birth control
"About 6 months in I began getting a little moody, but didn't think much of it. My periods have begun to get really heavy and I never know when they are going to stop or start. Sometimes it will last 4 or 5 days and sometimes I'll have my period for a month straight. My mood swings are absolutely terrible lately and I've  had some depression (I'm generally a very happy person). I have headaches regularly and have pregnancy symptoms all the time, such as sore breasts, spotting, bloating, and nausea. My boyfriend and I have barely been able to have sex because of the almost constant period, so no wonder you don't get pregnant! And my sex drive is much lower after getting it inserted."