Discomfort in or on your scrotum isn't really a herpes symptom. We don't have exact percentages per sex act, but that sounds about right - she uses suppressives, and you used a condom. The chances that you'd get herpes from her are so very, very low.
If you were in a long term, monogamous relationship with her, and just avoided sex when she had symptoms, you'd have about a 4% chance a year of getting it. Using condoms cuts it half, as does using suppression. In a relationship, using both, it would be about a 1-2% chance. A one-time, fully protected encounter is even less.
You left out how long it's been since you had sex with her, so I can't address that part, but I'd agree that this might be anxiety. Do you have any signs of a rash? Any bumps? Anything?
I don't think you have anything to worry about here.