So first, you and your doctors are totally over-reacting to your risk level here.
I'm surprised they put you on PEP, as 10 seconds of unprotected vaginal sex for a man is so, so unlikely to result in HIV transmission. I'm including some threads at the end so you can learn more about that.
The bumps could be hsv2. They could also be a dozen other things, and the only way to know for sure is to get them tested. Go today, tomorrow at the latest, and ask them to do a PCR swab (if they can't, make sure it's a type specific culture) to see if it's herpes. Timing is important. The PCR swab is more sensitive than a regular culture, but a lot of places don't do the PCR swab, so getting in while they're new and may have a lot of virus present is vital.
It doesn't sound like herpes - that's usually ON the skin, not under it, and they hurt when touching them, but you want to be sure. It would also be unlikely that you got herpes from 10 seconds of exposure unless she had sores present.
Here are some threads you can read on HIV transmission -
https://
www.medhelp.org/posts/HIV---Prevention/Probability-of-contracting-HIV-from-a-single-unprotected-exposure-/show/1804412
https://
www.medhelp.org/posts/HIV---Prevention/Freaking-out-about-one-time-unprotected-encounter/show/1274739
https://
www.medhelp.org/posts/HIV---Prevention/Confusion-about-HIV-risk/show/256240