is there any possibility im pregnant??

i have been dating my wonderful girlfriend for about two months now, but a few weeks before we got together i slept with a man. Now my period is late by a week, and though I’ve gotten my period since sleeping with him im still very concerned as it has never been this late before. We used protection so i know its very unlikely but im still scared. Any ideas why its so late?

edit: realizing w about 90% certainty it is the stress of going of my anti-anxiety meds