Anyone hCG NOT double at first?

Me
Monday I found out I was pregnant and my hCG was 89 and my doctor figured I was about 3 weeks along. 48 hours later she drew blood again and my hCG only went up to 106. She wants to draw blood again and check levels Monday and I'm so nervous. She said they should've went up by 60% and they didn't so I'm pretty upset at this point and Monday seems like a million years from now. 
Anyone else have slow rising hCG at first but then it go up and everything turn out okay? 

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