Welcome to HCM.
Just by symptoms like diarrhea
and sore throat
alone, one can not be labled as HIV after a risky contact.
There are people remain HIV negative even after years of regular sex contact insipte of their spouses are having HIV (30-40%) and called as Sero-Discordant couple.
As per CDC, Atlanta 5 per 10000 vaginal penetration is infectious. So you need not worry.
Even if your sex partner is negative for HIV, she could be in Window period. So you have your HIV test
and rule out HIV with you.