Can a girl get pregnant, on the pill if I also used an extra safe condom and didn't finish inside?

I had sex with my girlfriend around a week ago. And yes we are of age, but I wore an extra safe condom. I also didn't finish inside of her (( im aware this changes nothing but surely it's better than actually ejaculating inside of her)) and she is on the pill. surely any person wouldn't worry but she has been feeling ill recently with stomach aches and vomiting. she claims there is nothing to worry about, but I have an anxiety disorder and im really freaking out. can someone tell me the chances of being pregnant? im kinda nervous. please help put my mind at rest!