Pregnancy worry

Soooo my bf and I slept together for the first time today... It was kind of really spur of the moment and we didn't have condoms or anything...

He pulled out though.

The plan B is kind of expensive... So I'm not sure if I have the money to purchase it...

My fertile window isn't for another 8 days but I'd like to know what are the odds I'll get pregnant?

I'm a teenager so it'd be problematic... He and I are getting condoms tomorrow. But because of today... What do you think are the odds?