Hmmmm. I think you are saying that you’ve had 3 incidents of unprotected intercourse since the negative western blot, is that correct? and now you are at 3.7? The odds are in your favor that this is a false positive, but that number is too high for me to feel comfortable telling you that you are fine without doing it again. I know it’s a hassle and expensive, but honestly, probably best to repeat for greater certainty.