I had sex with my partner today, and she's 4 days before her ovulation kicks in. we used a condom and pull out method. what are the chances of my partner getting pregnant..?

If you use condoms perfectly every single time you have sex, they’re 98% effective at preventing pregnancy. But people aren’t perfect, so in real life condoms are about 87% effective — that means about 13 out of 100 people who use condoms as their only birth control method will get pregnant each year. ref: https://www.plannedparenthood.org/learn/birth-control/condom/how-effective-are-condoms