I had protected vaginal intercourse in Vietnam with a CSW almost 3 weeks ago, I am pretty sure that the condom did not break or slip during the action. After I came back to Singapore, I went to the doctor to seek for advice, the doctor says even if with condom there is a low risk of getting hiv, so I did a HIV PCR RNA test at 11 days after exposure, the result came out negative, but doctor recommended a follow up duo combo test at 28 days of exposure. Since then, I’ve been really anxious about it, I thought I am well protected if I use condom, is the doctor telling the truth? Am I at risk of getting HIV