Haven’t gotten my period this month on my birth control?

So last month I got my “withdrawal” bleed around the second day being on the placebo pills. And it was my first month of birth control ever so it hurt real bad and it was very heavy and lasted for like 5 days maybe. But when I got back on the pills, my boyfriend and I decided not to use a condo and he came in me right at the beginning of my second pack, so me being scared went a took a Plan B. About a week later my boobs started to hurt again, they hurt all of the first month. I started having nausea at random points in the day for the past 2 or so weeks, and my boyfriend came in me 2 more times near the end of November on the 27th and 28th. I’ve had some cramping, the nausea, really sore boobs (except now that I’m on the placebo pills they hurt a bit less but still hurt) and I’m on my third day of the pills and still no bleeding. Last month I got mine on the second day of taking them pretty much. Am I pregnant? Did the Plan B mess up my cycle? What do you think?