Is my girlfriend pregnant?

Hey everyone, this is a new account to remain anonymous for starters.

Me and my girlfriend had sex about a week ago for the first time, we were both virgins. I didn't have protection but I didn't even really get close to cumming, I just pulled out very early for precaution. I had not cummed anytime recent before this so I should be clean.

Since then my girlfriends period is a week late. Could she be pregnant? Please help Reddit you are my last hope! I am freaking out.