Is a darkening Line on positive pregnancy test really mean anything or is that just a myth? Line progression test pics attached

Tequila

I went for labs on 7/18 and my HCG level was only 86 my doctor was concerned about the low level and ordered me to come back on Monday 7/22 to be sure the numbers are doubling. I had a chemical in May so I’m freaking out that it’s happening again. Due to paranoia I’ve been peeing on sticks every day, haha Lines seem to be slowly getting darker but I’m not sure if that truly means anything.. all test are with First Morning urine. (FMU)

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