Does sex make your period irregular????

So I lost my virginity last year I was 16 going on 17 and since then I pretty much have sex a lot and all the time yes me and my boyfriend use condoms and there sometimes were we didn't but lately we been using of course I always worry about getting pregnant since I lost it but I feel like since I started having sex my period is all over the place did this ever happen to you guys or what is exactly going on with me?????