Sex without condom woth prostitute! Help?

I had sex with a prostitute with no condom but didnt finish inside of her.... Im really worried if she is pregnant.... She told me she was clean and had a doctors check up... I pulled out way before i could come... Im really worried to see if she is pregnant... She doesnt know who i am... And she doesnt know my name... Im just really worried... Please help I dont think she will be pregnant but its my conscious that is bothering me what i did was wrong.... I did it with one girl before and pulled out amd she didnt get pregnant... But since this is a girl who does this regularly im assuming she takes the pill or is on birth control. Please help im feeling desperate and going crazy thanks!