Hello, doctors and epidemiologists around the world overwhelmingly agree that HIV is only transmitted by unprotected vaginal or anal penetrative sex, sharing needles or mother to child.
Oral sex is not considered a risky activity, because there are no reports of people getting HIV by doing it.
There is no need to worry or get tested for HIV, however unprotected oral sex might carry a small risk for other STDs, you could ask in the STD Forum if you wish.
About symptoms, some HIV positive people, but not all of them, reported that around 20 days after their exposure they had fever, sore throat, rash and flu (not cold) like symptoms, all of those came together, or within a few days of difference and lasted for a few weeks.
The same symptoms are present in many other illnesses and not everyone had them, so, we can’t rely on them to diagnose HIV.
Hope this helps.