My advice is to wait - I know it sucks! Bloods may not necessarily give you a result either way - they could come back inconclusive, which is what happened to me when I had my chemical pg a couple of months ago. But if you think you are 6 weeks, you should definitely be getting positive HPT by now. You may be earlier than 6 weeks, in which case waiting is the best option, as it may be too early yet to get good reading on HCG level.