Plan B

Hi ladies. Most of you are probably trying to convince, but if you have ever taken plan B I'd aporeciate any feedback I can get. My periods are pretty irregular. I missed my period in November. Had unprotected sex on Nov 20th. About 36 hours later I took plan B. A week later had a heavy period for six days. On the seventh day I had unprotected sex. Its been five days since that and I'm experiencing pelvic pain as if im going to get my period again. I've also been crying for no reason. Is it possible to ovulate right after your period???? Please don't judge me. I am not trying to get pregnant but wouldn't mind if I am.