may have gotten gf pregnant from precum

me and my gf were messing around without a condom yesterday and we r both virgins and we decided to go in a little and i went in a we went a little deeper and i was in about not even a min and i was coming out and i was almost sure that i felt some precum come up i dont know if it came out or not but i am freaking out that it might have and i am freaking out what r the chance of her being pregnant