Worried about pregnancy?

had a one night stand with a friend of mine, she is 41 and had a tubal 17 years ago and she was married and had regular for 16 yrs after the tubal. We had to much to drink and made out but I did not get off in her. I am worried she could get pregnant but she says I am nuts since she had a tubal 17 years ago and I pulled out. Should I be worried about this 1 time or Should I just get a grip and forget about it. BTW I dont want kids and I am having panic attacks from the worrying, and like I said she is not worried one bit and thinks I am nuts.