Me and my boyfriend had sex on a Saturday for the first time and then on that Monday I had bad cramps and started bleeding, it went on for a week (same amount of time my usual period would take) and then stopped just like a normal period would, then two Saturdays later I had sex again and the same thing seems to be happening except I just got off my period last week?? What’s going on?? I’m on birth control and he used a condom.