My period is 4 days late!

Darian • August’s mommy! ❤️
I had sex 5 weeks ago and got my period exactly a week after. But now my period is late and it never usually is. I can't find much online about whether it's possible so I'm asking you guys. I know I'll have to test if I don't get my period at all but I'm just wondering if it's possible. Help? :o