[Coffee.]

First of all, these are the intitial symptoms of an STI:

...where I'm going is that this early, there are no symptoms. This is probably a mild infection. People carry bacteria. Even if it's not from sex, you just may not be used to the bacteria she carries on her body, you know, that kind of stuff. I doubt it's anything serious. Did you use a condom? Could it have caused an allergic reaction of the both of you?