Pregnant or Paranoid?

I used a condom with the person I had sex with 3 days ago, and the condom worked well. It did not rip and it stayed on the whole time, plus he pulled out before he came so he didn’t ejaculate inside of me. I’m a very paranoid person, and I’ve had a pregnancy scare before where I took plan B. I considered getting it this time to be extra safe but I ended up not getting it. I’m very scared, even though I know the chances of me being pregnant are super low. My anxiety is taking over, and a day ago I had a gas cramp in my lower stomach and today my leg has been sore but that could just be because I slept weird. Do you think I’m okay if the condom was successful? I’m young and new to this! Thank you! Would save me a load of worry.