Missed Period Help

So I took Plan B in the beginning of October, and it caused me to have two periods during that month. My normal period was scheduled for the 21st of October. I was supposed to start November 18th (according to this app, it pushed it back a few days because of it being late) but I haven’t started yet.

I did have sex after the two periods in October, but a condom was used and it definitely did not have a hole in it that time.

I have very little cramps that are barely noticeable, acne (more than usual), and I did have sore boobs for a couple hours on the 19th.

I’m really worried because I don’t want to end up pregnant. Any ideas if I’m just late or maybe pregnant? My cycles are normally 25-30 days long.