It would be very unusual to get HSV 2 from receiving oral sex indeed. I seriously doubt that this occurred but now that you have an equivocal test, it is impossible to say for certain. The small dark spot to me sounds like a little bruise from vigorous oral sex, perhaps? I think if I were in your situation, I would ask the masseuse to be tested for HSV 2. Pay for it and get it behind you. Tell her the situation you are in and about the pregnancy and the spot. Also, if you haven’t been having sex, it seems like you could wait another 6 weeks and get a western blot and be certain. Is there a change happening that you now feel the need to have sex with your partner?