Do darker lines mean rising hcg levels?

I did a home pregnancy test yesterday (FMU) and got a BFP with a vfl. Had blood drawn later that day and hcg levels were VERY LOW. Doctor told me to go back friday to see if numbers we doubling. Took another test this morning (FMU) and the line appeared quicker and darker. Does that mean my hcg levels are rising? 

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