I’m trying not to stress

Okay, so a few weeks ago I had mono. Me and my boyfriend had sex Sunday (w/o protection) but he always pulls out. My period was supposed to come the 27th but it hasn’t come yet. Last time I had my period it was late by a week. I read up that mono can delay or make you miss a period cause of all the stress your body was/ is under, and it’s rebuilding itself. So should I be worried? Should I just wait to see if my period shows up in a few days?!