Pregnant??

I need some advice I had unprotected sex with my boyfriend on the fourth of July he pulled out way before he finished like he always does, but I have high anxiety so I bought generic plan B less than 24 hours after the fact. I had sex while I was ovulating but I wasn't aware. I have been feeling a tingling pain in my lower back and abdomen and I'm 4 days from my period. Could that be pregnant related or just period syptoms??