Weird Levels

Cathy
Last week, I had some spotting. I went in for blood work and the first pull was good. The next pull, progesterone had dropped. My doctor said it was probably a miscarriage so I cried all weekend and came to terms with it. They did another blood draw on Monday to make sure levels were going down and holy moly they didn't. I am so confused. I have my first u/s on Monday (3/6) to confirm. Has this happened to anyone else? Will this be a blighted ovum or something like that?? I am 7 week exactly today. Here are my levels:
2/20 - HCG 15,523 Progesterone 20.6
2/22 - HCG 21,333 Progesterone 15.9
2/27 - HCG 66,677 Progesterone 16.1
I'm trying not to be hopeful especially considering the progesterone drop but I think the numbers look good. They won't move my u/s up since it's on Monday.