Hello. I Am 19 Years Old And Completely Scared. Me

Hello. I am 19 years old and completely scared. Me and my boyfriend were fooling around and never had sex. He put his penis on the outside of my lips. He says he was completely dry but I was still scared and still am. I was so worried he bought the plan b and we learned after that there is a weight limit. I am 172 lbs. I got my period I believe a week earlier than I was supposedto about two to three weeks after taking the pill. I am still scared. I don't know what to do . I keep getting this weird feeling in my stomach and I think I might be hurting myself from worrying so much. I tried the toothpaste pregnacy test and nothing happened. Please help. Thank you for your time.