I had with a slutty girl and kept on ******* her after ming in th condom. I am scared of having stds.?

Could I have gotten one under these cirstances? I am really freaking out. I don't think she has stds but I am scared none the less because my friends at school tease me about it because she has a reputation for being promiscuous. They don't realize that I am mad scared. She is not pregnant (thank god), but I haven't been able to function properly because of my anxiety. She is 16 years old. I know I should have pulled out after ming, but I didn't want her to think I didn't last long. I don't think that it slipped of or broke, but I cant remember for sure. Am I at risk or are my friends just being ******* . Please help me out, I am scared out of my ****** mind.