Could I be pregnant or am I paranoid??

I had sex with a condom about 2 weeks ago, but my boyfriend only lasted about 1 min and possibly came in me. My period is 3 days late and I'm so frantic I don't know what to do! I mean am I overthinking it? He did use a condom btw, and I've been experiencing period symptoms for the past week, could my period be on its way soon?