Wait it out there's no harm of your not bleeding I had a mmc 5 weeks after my baby had died and I had no idea I found out at ten weeks baby was only measuring 6 then I had a scan a week later and no change with baby so booked for a d&c but naturally lost that night I hope all is well if you still have pregnnacy symptoms such as sickness ect then don't worry I had non and that's a sign things aren't going right sometimes xxx
Go by what your gut tells you. If you're not ready for a d&c then don't get one. Some doctors are quick to do one. Maybe get your levels checked again and see if they are going up or down. If you are miscarrying the numbers will go down.
Unless you are in trouble from fever or bleeding, I see no real problem in waiting a couple more weeks, but in your shoes I wouldn't wait longer since you would have the risk of creating a situation in which your uterus gets some scarring from the tissue inside it. But you are certainly within your rights to want to be sure. It seems you've seen a sac and no baby but have high hCG levels, correct? You need to ask the doctor what he or she makes of those high hCG levels -- is a molar pregnancy suspected (or ruled out?) Is there is any chance of an ectopic somewhere else besides your uterus, to cause such a high number? (In the latter scenario, this would be in addition the sac they are seeing in your uterus.)