Around May I Got Back On The Depo Shot I've

Around May I got back on the depo shot I've been on it before but there weren't any side effects really when I got off. So around May I got back on and was on for the three months I experienced bleeding during sexual intercorse. I talked to a family memeber and they said not to do it so (rough) or not at all we went slow and I stopped bleeding but it turned into brown discharge and when we a have sex it would be brown on his penis. So after I got off the shot in August I just been having a brown discharge it would go away then come back. I did research and it said it would go away in three months but I just need clarification.