***UPDATE- I started bleeding 19th and dr said it was a very early miscarriage 💔😭*** I have 2 tests left and decided to use one to see how much darker line got. Well this one was with FMU and it’s way lighter than the rest and I’ve been getting positive tests since Tuesday. I know it takes 2-3 days for HCG to double but why would it get lighter? Should I be worried? Thinking of calling dr for blood work. Anyone have this happen and everything was fine?