He pulled out when he ejaculated and didn't ejaculated inside of me. But when he pulled out, the condom somehow accidentally a quarter length stuck inside of me so some his cum landed on my inner thigh. I'm 90% sure none of his sperm touch my vagina and it couldn't reach inside my vagina since the quarter length condom was still stuck inside of me, right? And I immediately wiped his cum off of me afterwards. 

I'm almost 100% sure it's nothing to worry about. Should I be worried? Just want some opinions 😕