OK so I had sex about three weeks ago for the first time in little over a year we had it three times on that weekend and we used the pull out method now I am ten days late for my period and I am not sure if I am pregnant? Could I be not sure?

Anytime you have sex there is a chance of pregnancy, no matter what. I would take a HPT, if it comes out negative wait 5 or so more days and take another one. Good luck!

The timing of intercourse here sounds about right for pregnancy BUT there could be other reasons you haven't started yet as well... stress being one of them.