late for the first time

So I've been on birth control for about 5 1/2 years because I have mild pcos and I just recently started having sex. My period always comes between Sunday afternoon and Monday night. And it's late. We have only forgot a condom once and he didn't cum that time so he keeps telling me not to worry but I am because I'm still in college and rely on my parents to pay most of my bills and they would freak out if I had to tell them I am pregnant. I want kids just not right now and not with someone that I'm not committed to. Should I be worried already or just relax and give it more time? I have no clue what to do I've even went as far to look up how to induce a miscarriage online and I don't even know if I'm pregnant.