I am freaking out

So I’m worried because i had sex but it was with a condom on and the condom didn’t rip because my bf blew into it and tied it up just to see(I know weird but I heard it works and I asked him to) and then i took a plan b two days later?? Will I end up pregnant? My app says I’m late but I’ve been super crampy and just stressed out of my mind. Please help! It’s been about 2 weeks since the sex!