5 weeks, lighter test line

Update: Test line was light this morning too. The nurse at my ob office said there is no truth or myth to the line theory. I’m holding onto hope. I can’t get a blood test again until Saturday.

So my last hcg was 25 on July 18th. I’ve been on vacation since the 20th and can’t get it checked again until the 28th. I’ve taken 4 tests while gone. First three had be feeling pretty good. All FMU (first digital positive and second and third pretty decent test lines).

Today, I took another test - NOT first morning urine - and the line was lighter. Should I be worried? Should it have been dark no matter what since I’m a few days further along? Or should I just chalk it up to diluted urine???