Pregnancy from dripping semen?

Hi everyone, I wanted to share my situation and see if anyone has gone through something like this before.

About an hour ago, I was with my girlfriend. There was no penetration at any point, but I did ejaculate on her chest.

The semen started to slide down, so I had to put my hand there to stop it from reaching her vagina. I managed to block it for about 30 seconds, but then it dripped down anyway and landed on her outer labia (lips).

She wiped herself off with some tissue, and according to her, nothing actually got inside.

According to her calendar, she isn’t in her fertile window right now, but since she has an irregular cycle, you never really know.

I know this might seem like a silly question, but I’d like to hear about your experiences.

Thanks!