Can precum make you pregnant?

My boyfriend and I were having fun in the car and i sat on his lap and he rubbed his dick over my pussy but he hasn't penetrated me or put it in.
<a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> said i had 8% chance of getting pregnant that day, im not sure if he had any precum by then but He might have had Im not certain. 
I can't be pregnant and im freaking out please help.