The chances of you getting herpes from a 1-time, protected encounter (even if you had sex with her twice) are really slim.
Have you ever been tested for herpes? Do you have hsv1 already? If you do, your first hsv2 outbreak wouldn't be a primary outbreak, and may not be bad. Since you used protection, and I'm assuming she didn't have any symptoms at the time, you'd likely have more than a couple of tender lymph nodes.
How was she tested? Did she have symptoms? Was it a blood test? I ask because if she had symptoms that they cultured, you could be her source. If she had an IgG blood test, she's had it prior to you. If she had an IgM blood test, it is an inaccurate test and she should get an IgG test.
You can test now - ask for an IgG type specific blood test - and then again at 4 months. If you are negative now, I'd be very surprised if you were positive later.
You can read more on all this here - https://westoverheights.com/herpes/the-updated-herpes-handbook/
Well after I had sex with someone with HSV2 heres what happened to me:
Penis tip tingling
Balls felt sweaty/sticky/heavy
Penis skin felt numb in some spots
Soreness in neck
Lymph node swelling in armpit
Bump in pubic hair
Itching in genitals/anus
Random nerve burning throughout body
Lower back pain
Penis burning at tip after pissing/ejaculation
Itching inner thighs when walking
All started after less than 5 seconds of exposed sex with a female.