I feel like I'm just being paranoid...

But last month when I was on my period (don't judge please. He's fine with it and so am I.) my boyfriend and I had unprotected sex, but the very next day he went out and got me Plan B. My period chart says that it's supposed to come tomorrow, but I'm just worried...I've been feeling like it was on its way since this morning but my anxiety is getting the better of me...