Teen freak out! My periods late! Help!

Hello everyone! Good morning / evening!

I’m 17 years old and have been having my period since I was 11.

Last month my period was 4 days early, when my period was usually right on time, maybe a day early or a day late; But I really just didn’t play attention to being 4 days early and went on about my day.

Well this month..... my period is 6 days late!

I have never been this late besides last year when I was 12 days late for my period.

But I have not been this late since then!

6 days late! I’m freaking out!

I’m not worried about pregnancy as I don’t have sex ( All my boyfriend and I do is dry hump with all our clothes on LOL )

What could this be? Please help!