HCG levels 4w3d

Je
At 4w3d my levels were 553. The nurse who called me scared me saying that they're low and we have to wait and see if they'll double. I just got my blood drawn again today at 4w5d and I'm just a ball of anxiety. First pregnancy and I'm just so nervous! 
Has anyone else had experience with this? Are these bad or normal numbers? 

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