In need of some opinions

Not sure if I'm in the right group sorry if I'm not. I have been trying to conceive for a while now. I have been though I miscarriage at 12 weeks and had to have a d&c done. Since then I have been though 2 chemical pregnancies with the most recent being last month. This month when I took that first pregnancy test and seen that faint line I thought this was finally my time. Until this morning when I woke up to take a test and found my line was almost nonexistent. I was confused and angry so I decided to take another one. To my surprise the line seems to be getting darker. My question is why would my line go from "dark" ( not as dark as I would hope but there) "light" ( barely there) to getting "darker" again? I'm I getting my hopes up? Grasping at straws? I'm confused. I did call my ob and they don't have anything available until next Thursday.

Here are some pictures of my tests