I Was 12 Hrs Late For The First Active Birth

I was 12 hrs late for the first active birth control pill of my new pack, took it asap the next day and took all the others on time. Have never taken one late before that. I've had unprotected sex a few times this month. I moved out on my own so am very stressed also. I had breakthrough bleeding that lasted 6 or 7 days (started light and got heavier, had cramps) a week before period was due on inactive pills. Am I pregnant or was this a period? Will I get my period (the withdrawal bleeding) now that I'm starting the inactive pills?