Help help help

Okay so I had sex with my bf once and we used pull out method, it seems successful from what was seen to happen, this was a day before or two days before my period was due and I’m now missed 4 days. I know obviously you guys aren’t my doctor but does anyone know if I could be late or pregnant? I’m freaking out a little bit and I think it’s maybe because I’m stressed I missed it or because of my depression lately thanking a bad turn also my periods are sometimes a few days off but not recently...