Sperm and fingering

might be a silly question or not but if anyone can help me out in this situation I would appreciate it. I was messing around with this guy yesterday we didn’t had sex but he was jerking off (not sure if he came or not ) but about 5-10 mins later he fingered. I have a pretty regular cycle and I’m suppose to ovulate in 3-4 days. Is there a chance of pregnancy? Should I buy a plan B Incase there was sperm on his fingers.

Pleased no hate comments ; and yes I know I should get on birth control. Which I am after this stressful situation.