Leave you opinions? Should i be worried?

Had unprotected sex with my boyfriend on day 7 or taking birth control for my first month. He never came. Since then I’ve been taking my BC every day at the same time. It’s day 33 of my cycle (I usually start my period between 29 and 30 days) and I just took my first placebo pill today and I haven’t started my period. My mom said I wouldn’t start my period until I started the placebo pills. Should I be concerned at all? Idk if I’m supposed to start as soon as I’m off the pill for my placebo week or not. The only thing I’m feeling that’s off is sore boobs, but I usually get that when I’m about to start my period. Thoughts?