Anyone have your doctor tell you how far along you are based only on HCG levels?

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I had blood work done on Monday when I should have been 4 weeks 5 days. Based on my HCG levels my doctor said I’m around 2-3 weeks. I know this is wrong because my last period was Nov 28th, I know exactly when I ovulated and got my positive a week and a half ago which would not be possible at 1.5-2 weeks pregnant. Also I took a clear blue weeks indicator on Sunday that said 2-3 so I know add 2 weeks and it puts me exactly where I believe I am. My levels are 913, is this a bad sign? Anyone have something similar and just had levels on the lower range?