13 and might be pregnant

so i’m 13 very stupid i know. but i had unprotected sex 2 nights ago and he pulled out but was pretty close to cumming in me and i told him that was close and he said “no it wasn’t i promise” i was supposed to get my period yesterday and i didn’t which sometimes the apps not right because one time i was 2 days “late” but i need advice because i’m freaking out! my mom would killll me if i was pregnant!