Pregnancy tests getting lighter

[Kaykay82]

I'm hoping someone can give me an insight in to their experiences.
I tested positive a week ago, since then my tests have become lighter and lighter to the point of my digital saying not pregnant. 2 days ago it said 1 - 2 weeks. I have had bloods done, my first set was hcg at 37, and I am waiting for my second results which were taken yesterday. The lines are no so faint, almost not there... I have had no bleeding at all, I do have mild cramping and back pain.
Has this happened to anyone else?

Very sorry to say but I have had 3 early miscarriages and each time my first sign were the tests getting lighter and the digi test not increasing. In each case I didn't start bleeding until a good week after the test turned negative.

Yes, this is my worry... just holding out for my second lot of blood results but I think I know what to expect. Gutted to say the least x
Hoping for the best, preparing for the worst