A fever, alone, isn't indicative of HIV infection.
Test at the appropriate time to know your status for sure. You are catastrophizing over a single event, which carries a 1/70 risk of transmission.
I personally think that you are jumping the gun here. Yes, you did put your self at risk for HIV infection, 'if' your partner was infected. However, if your partner claims that he is HIV negative, there is a good chance that he probably is, because it's seen that most people don't lie about their sero-status when asked about it directly.
Symptoms are not used to diagnose HIV infection. I am pretty confident that post this event you went on to search the internet about ARS and that's where you bumped your head hard! 100 F is not high fever, it usually can't be associated with HIV ARS. HIV ARS fever as defined by people who have been through it is a mess, most people end up at an ER.
The best course of action from here is to wait until 28 days from the date of incident and test with a IV/V generation of HIV test. If you are anxious go ahead and get tested tomorrow, though it's not going to be conclusive, it could very well be indicative. Keep in mind- at this juncture, if p24 Ag is absent from the antigen & antibody sandwich arrangement of IV generation HIV test, it will be a good indication.
Typically, in a IV generation of HIV test, if detectable amount of antibodies aren't formed p24 antigen is probable to be detected and right after the p24 antigen depletes detectable amount of antibodies are usually formed. This, this mechanism that minimises the window period to 28 days and therefore this test is best taken at 28 days from the date of exposure.