Should I just calm down?

I had unprotected sex on Feb 20 he came inside so I took a plan B on the 22nd hoping I would be fine but now I been having really sore breast and I’m peeing very often so I’m like okay that’s weird so I go back and check the calendar and I was ovulating that week that I had sex and the point of the plan B is to stop ovulation so I’m other words it might not have worked I believe I was on my 4th day of ovulation. Could I be pregnant or could it just be my period coming?