Good luck at your doctor's appointment tomorrow. I will definitely be hoping and praying for a good outcome for you!
I'm only 7 weeks today and when I had my u/s, it was measuring spot on at 6w2d since my LMP. However, I find it so uncomforting that my levels are so low and not coming even close to doubling. I haven't had any spotting today, but I'm sure it will happen again tomorrow. It seems to happen every two days, and it only appears after I have a BM, (Sorry - TMI) but it's definitely red and takes a good couple wipes before it's gone. It never reaches my pantyliner, only the TP. It's so frustrating as when I go through a day with no spotting, I begin to believe everything is going to be okay, then my hopes are crushed when I see that red toilet paper. I also have constant PMS cramping, but with my last m/c, even though there was no bleeding, I was doubled over in pain from the cramps.
I hate that we have to go through this wait. I hate how m/c robs us of the excitement of being pregnant.
As for your numbers doubling, my family doctor has said that he was happy with the rise in my numbers because they do level out at some point. (I don't quite believe him because he doesn't know as much as my OB would, who is on holidays this week) However, in your case, I know I have read that once you are around 8-10 weeks, they do stop doubling.
Anyway, please keep me updated on how your appointment goes. I'm keeping my fingers crossed for you! I will, too, let you know how things progress with me. I don't have another u/s booked until Jan. 22, when I will be 10 weeks, but I may have to go to one earlier if the spotting does not stop.
Thinking of you!