Pregnant or Anxiety?

Hi! Last week I had sex, and today I’ve been feeling anxious, which has been making me feel very nauseous when I’m around food. I also just started working in fast food, so maybe that might be contributing to it. I do have very bad anxiety and I had coffee this morning, which may have triggered it bad. I was just wondering if it’s more likely to be my anxiety causing the nausea, it seems a bit too early to be experiencing pregnancy symptoms such as nausea this early.