Hey, my girlfriend and I keep a steady habit of having protected sex, about 4 weeks ago we didn't use a condom and she got her period. She already has an irregular cycle and things get a little confusing sometimes. But recently within the last few days, she was getting period like symptoms and bled for only a day and it was just gone. We had sex today (protected) and there was brown discharge on it. Should there be any concern? I mean she never fully got her regular period cycle.