Unsure and scared

Hi I’m 16 years old and me and my boyfriend were fooling around on feb 16( he was wearing protection and I check to see if there was holes )and my boyfriend didn’t cum or anything.also i wasn’t fertile that day/that week I was beginning to be fertile that upcoming week according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> , so right now in March I still haven’t gotten my period and I’m kinda scared if I’m pregnant because lately I’ve been feeling nauseous...