Late period. I’m never late.

Hello, I had been having unprotected sex for awhile (AFTER I HAD OVULATED) I took a plan b the first time but then didn’t later. I had also not had sex in a couple months. Now my period is 5 days late, should I be worried? Yes I know there is always a chance but I wasn’t ovulating during the time I was having sex so I’m just not sure. Also usually when I have sex after not doing it for awhile my period is late by 2-3 days. Anyways my question is should I be worried or wait a little longer before I start worrying?

I’m not on the pill, or anything.