Line not dark yet, 5 weeks... Input?

My husband and I have been trying for 7 months and it's finally happened this month! But they say your HCG Doubles daily, and I've noticed most of your ladies tests on here I have seen at the stage where I'm at (5weeks) or around (14/15dpo) have darker test lines then me. I'm worried, I know miscarriages are a chance this early and I am starting to stress over it. Any input? My doctors appointment isn't until November 19th :( anyone else take a while to develop a dark test line? I'm sorry if I'm being a worry wart, I have to ask.