Could I be pregnant?

My period is two days late and I'm freaking out . Me and my bf had sex almost a month ago but here's the thing ... nobody got off and we had a condom . He was in me for like 3 mins before his friends started to bug us . We always check condoms for holes before we use them and everything . This isn't the first time I've had a late period though before I became sexually active . Can someone just please give me some advice to calm down