How likely am i to fall pregnant?

Disclaimer- we were going to actively start trying in December so it’s not a massive deal I just want to know

I had sex on the day I got a positive LH test, he pulled out but not sure if it was a tiny bit too late. TMI- most of it was on me but there was a tiny delay. I haven’t had sex since.

I know there’s always a chance but would u say it’s very unlikely?