You are HIV negative because you had protected vaginal intercourse. Oral sex is not a means of HIV transmission and is zero risk.
Although had you had a risk, an HIV antibodies test at 10 days would be meaningless. Antibodies can take up to 12 weeks to develop; a 3 month test would be conclusive.
However, as I said, you had no risk.
A hiv antibody test at 10 days is non-effective. The earliest detectable hiv antibodies occur at 2 weeks. It's been said that a 4 week hiv antibody test can be 90% reliable and a six week one above 95%. A 3 month test after any possible exposure is definitive.
The hiv virus is surprisingly hard to transmit, even if the sex worker is a carrier of the virus the chances of you contracting it are small.
And also no symptom is a valid indication of hiv.