Could I be pregnant

Hey guys so about 4 weeks ago me and my bf of 2 years had unprotected sex for the first time since I stopped birth control, he didn’t cum in me but I’m worried there may have been pre cum. My period is late by 5 days but this is my first period since stopping birth control and prior to b/c my period was irregular because of my PCO. Is there any chance I could be pregnant or am I just stressing??