On birth control with late period :(Help!?

Asked: On birth control with late period :(Help!?Normally I take my birth control early in the day, but due to a different work schedule, I starting taking this pack in the evening. Saturday was my last active pill, but I forgot to take it, so I took it Sunday morning when I woke up. Normally I get my period on Weds, but it's Thursday and I still haven't had it (though I have bad cramps and acne per usual). Is it likely just late because I took the final pill late? I'm not totally freaking out, just confused. I haven't had sex since my last period, which was

acne