24 days ago I have PROTECTED vaginal sex with a female CSW. Condom was on before insertion, on after insertion, and was intact. I stayed in for a brief period after ejaculation (don't know if that is relevant). I understand this is very low risk (it at all). At 21 days post I did a Oraquick rapid home test (oral fluids). It was negative. I get that nothing is conclusive until three months (I've read many of the replies in this community), but how reliable is this negative result at 21 days? Thanks.