Keep in mind she wasn't a 'high risk' person. She's not in the sex trade. However, agree that you now must get tested when the time comes post pep. I think pep was completely overkill. Surprised they gave it to you. It's a hard drug to take tolerance wise (harsh side effects). So, test on the schedule they give you when you stop taking the medication. Plus, since you got it at an ER, follow up with your regular doctor. They may decide you don't need it and stop it. That's probably in your best interest.
Unless your partner was known HIV positive person, you didn't qualify for PEP.
Unprotected vaginal intercourse would warrant testing, the soonest you can take a test is at 28 days with a IV Generation HIV test after your last dose of PEP.
You are most likely to receive a negative result for 2 important reasons:
1. Not everyone is HIV positive, there are a million chances of your partner being HIV negative.
2. It is observed very often, for a male to contract this virus from a female partner through vaginal sex is difficult, it usually takes multiple unprotected exposures for viral transmission.Your exposure was brief, in the last decade, this forum has not seen a single individual come forward to report acquiring this virus in this fashion.
You must refrain from symptom surfing on the internet until you suffice your window period because it's seen that it only makes people anxious and think in irrational ways.
If it is viable, just reach out to your partner and simply ask about her sero-status, people normally don't lie when asked directly.