AM I PREGNANT??

me and my boyfriend had unprotected sex on tuesday the 24th and i ovulated on that sunday (the 22nd) he came in me but i took a plan b 8 hours after just to be safe. i thought i was okay but my period is supposed to come in 4 days and i have no PMS symptoms should i be worried? i’ve also been feeling kind of nauseous but that’s the only symptom.