I've already explained to you that your chances are really low - https://www.medhelp.org/posts/Herpes/Confused-and-scared-/show/3049080
The head of your penis being exposed doesn't much matter with herpes - it's any of your genital skin coming into contact with your partner's genital skin.
The incubation period for hsv2 is 2-20 days, depending on the source you read, but the average time is 4-6 days, if you get symptoms. Some people don't.
Your unprotected contact was very, very brief. I wouldn't worry about this at all if I were you.
Your partner doesn't owe you her test results. It would be nice if she shared them with you, but she doesn't owe you that. You had casual sex, and knowingly took the risk.