Low hcg is this line getting darker?

Sa
My first beta hcg came back at 21 when I should have been 4weeks on the dot. I had a second test two days later but because it's a weekend I won't hear back until tomorrow. To help ease myself into some closure that maybe I'm going to lose the pregnancy I took a test today hoping that I would either get a definite positive or negative. Instead I am just as confused. The first test dating dec 9 was the day of my beta test. 

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