Late period, just started birth control

Hey y'all, any and all (experienced) input is welcome, because I'm getting nervous: I just started taking birth control a month ago and I haven't had my period at all yet, even though I just took my last sugar pill today and start a new pack tomorrow. I've had otherwise unprotected sex pretty frequently since then... Should I be worried?? There has been zero bleeding so far 😭 I'm taking Gildess FE 1/20