Am I just freaking out?

Me and my boyfriend had sex and an hour later I was giving him a blow job and there was no precum and I made sure cause I tried sucking to see if anything would come out or anything. and no precum was there and so he put his penis inside me for like a second just to see how it feels and it didn't seem like there was precum on it after either.so am I going crazy I can't be pregnant right? I just got scared out of nowhere period is like 2 weeks away

plz someone respond