SOMEONE HELP ME !!!!

My last period started on June 5th and ended on June 10th . Me and my boyfriend had unprotected sex on June 26th . He pulled out and didn’t cum in me . But he did pre-nut before we had sex . According to this app i’m 10 days late on my period . i haven’t took a test yet cause i’m scared . But my period is irregular sometimes . Could i be pregnant?????