Did I just get myself pregnant??

First and foremost pregnancy isn’t exactly what I’m hoping for or wanting at this time in my life but here we go ...

I got my IUD Mirena taken out on Tuesday October 8th and started the pill the next day. I had sex 3 days after being on Microgestin fe 1/20 unprotected with my boyfriend and he ejaculated inside of me. Also worth mentioning I’ve been on my period since about Monday/Tuesday. So during sex I was on the 3rd or 4th day of bleeding.

Really needing opinions and an opinion on whether I should take a plan B or not.

I didn’t like the IUD Mirena but am considering getting the non-hormonal copper one in the future.