Welcome and thanks for posting your query to HCM.
I can make out how much tense you are from last couple of days post the incidence. the very first thing to be told to you is your fever
and headache are not at all related to HIV
. Yes HIV infection do manifest as fever and other of symptoms less commonly as headache, but these symptoms appear around 3 months and at the most earliest after 2nd week of exposure and never within 2 days of exposure.
Now after reading the whole series of act during the sexual act, the important of the thing is -you are not known to the status of the lady. There are 50 % chances that she might be HIV positive. In that case the best and earliest test to take your worries out would be RNA
PCR test after 2nd week. There are though less of the chances of acquiring the HIV in this brief exposure. You should not be nervous at all as there is also 50% of possibility of HIV negative status of the lady.
Now the last point of advise is that in today's world of HIV era you should always take the best of the protection in form of condoms.
Hope to give you the best of the information.
With best health wishes,
Dr Sanjay K Kanodia
MD ( Dermatology and STD/ Venereology)