Late periods

So I’ve always had really irregular periods that could go from normal to missing for 2 weeks to 3 months. Before I had sex for the first time I was getting heavy symptoms for my period that was supposed to arrive. After having protected sex it than arrived late by a month and a half. Recently, I had protected sex and my bf also did not cum while inside of me. My period is late again. Is something wrong with me? I don’t understand what’s happening with my body. I even got scared of being pregnant but I see no way I could be when the condom didn’t leak.