Am I stressing too much?

Me and my boyfriend have done sexual activities but penetration was never one of them. I feel kind of dumb saying this but, am I pregnant if his penis was stowed away in 2 layers untouched? We did dry hump each other if that helps. Also, I have a lot on my plate since work and everything I'm constantly under a lot of stress, so did I skip my period because I'm under a lot of stress or is there another reason?