HELP. LATE PERIOD/ NO SEX

Juli
So, I had my last period the 22 of October and my period of this month was supposed to come the 23rd. My boyfriend and I have never had penetrative sex but we've fooled around last month way before my last period began. But now it's 4 days late and the month is about to end and I don't know what to do! My period is never this late. Any advice?