Had sex. Period is late.

My boyfriend and I had sex last Wednesday (6/29). He used a condom. And we didn't have much time, so he didn't even finish. My period was supposed to be two days ago (7/2), but I still haven't gotten it yet. I am only 17, and my period first started 2 years ago, so I'm not quite like clock work yet. But I'm just scared that something may have happened.. Because when we first started he was teasing me with his unprotected penis, but it didn't enter. --Worried that my period is late because I'm late sometimes normally, or late because I'm pregnant.. Someone give me reassurance 😅😓