Help me I’m honestly scared

So I’m 16 and I’m a Virgin. Last month me and my boyfriend were being stupid and fooling around and he rubbed his penis on my vagina. He had no cum on it I was just afraid if there was precum but he swore there wasn’t. I was scared I was pregnant and freaking out but he did it 9 days before my period started. My period last month did thankfully start but now I’m afraid this months period won’t start. I haven’t done anything like that other then jerking him off and letting him cum but I had my pants on and I washed my hands immediately very well after and didn’t touch myself or let him touch me. My period for September is suppose to start tomorrow and I’m afriad it won’t start because usually my periods start early and this month it hasn’t and I’m so freaked out. Today I have had cramps but they go away and come in like waves and I felt a lot of them after when I was done master bating today and didn’t know if that’s what caused the bad cramps. Basically moral of the story is I’m afraid I’m pregnant from the last scare I had because I’ve read stories that you can be pregnant but still have a period and I’m just afraid that tomorrow my period won’t start can someone please help ease my mind. And thank you for reading this far if you did.