Input please!!!!!!

I am 5 weeks 5 days along so still super early with my second little babe. I’ve taken multiple tests which all say positive - including a digital. But my concern is that the line isn’t seeming to get darker. I just found out 3 days ago so not much time has passed, but I automatically go into panic mode because I’ve had a MC before having my 1st. At what point did you ladies notice the line getting darker on your tests if you retested? My first appointment isn’t until March 11th to confirm the pregnancy.