HELP SOS 🆘🆘🆘

Hi so I’m 16 and have been with my boyfriend for a while now and use protection most times.

We had sex while I was on the last day of my period so i wasn’t bleeding at all pretty much, but we didn’t use protection and he came in me.

Now I’m three days late on my period and I dont know if I could be pregnant or if I’m stressing too much !!! My period is regular and I can always tell when it’s coming, but I haven’t had any symptoms like I normally do

Please help xxx