Extremely nervous

I'm just extremely scared... Me and my boyfriend have never not used a condom. Also when they have broken in the past we have used plan b! This is all well and good until the other night he wanted to see what it was like without just for a second or so...( I am the first girl he has ever been with) I don't remember exactly when my last period was and I'm dying waiting for it to come but what does everyone think... I honestly need some support.