7 days late!

The last time I had sex was Oct. 30 
I am never late on my period.
They come every 10th of the month. Well I had my period on Nov 10 so i know I wasn't pregnant cause it would've been to early. It's been over a month and my period is 7 days late. I don't know if I should take a test or not?
 I don't know October will count cause it's been over a month.