Ttc chances of pregnancy?

My bf & I decided to start trying! 😁 I’m 3 days away from beginning my fertile window & we had unprotected sex, but he didn’t finish because the boxing match started. 🙄 However, I know pre-cum can get you pregnant & I heard it’s better to do it 3-5 days before you ovulate so that the little bean will stick 🤗

What are my chances? & how long after trying did you fall pregnant?