Re: rapid hiv blood test
A 4 week test is about 90% accurate, meaning 90% of the people that were actually infected from an exposure would test positive at that time frame. At 6 weeks it is about 99%. 3 months/90 days/ 12 weeks is still the official guideline for being 100% conclusive.
IMO....Add up the very low chances the woman you were with actually being infected, the quite low chance of being infected on a single exposure if she were infected, plus a 4 week test would be pretty reassuring to me. A 6 week would be extremely unlikely to change. After a negative 6 week, I would have close to zero worries with a follow up 3 month confirmatory antibody test.