Painfully Scared.

Okay. I'm 18. Yesterday I was giving my Bf a hand job in the car with my RIGHT hand. My left hand was on the car seat. He finished and got jizz on his hands so he said he wasnt going to finish me because he Didn'y want to accidently get me pregnant. So I finished myself off in front of him with my LEFT hand. I keep thinking of stupid scenarios that may have happened last night where I could be pregnant... Am I going crazy? I CANT AFFORD TO GET PREGNANT PLEASE HELP ME IM FALLING APART....