Sore nipples?

I have never really had them be sore like this before. It happened the day after I had sex with someone without a condom for the first time (I have Nexplanon) so I'm like OMG PREGNANT but obviously its too soon for signs 😂 just a paranoid brain lol. My period is supposed to come in a week. Do they sometimes just get sore for no reason? It's been like a week.