Are these lines getting darker a good sign?

Hayley

So here are my tests from this cycle. Last 2 cycles I've had chemical pregnancies at 5w and 5w2d, so hoping for 3rd time lucky. The fact they are getting darker is helping me to feel positive. Last 2 cycles I only did the 1 test. This time, I thought I'd keep testing to prepare myself for a cp if the lines got lighter.

1st picture CD 31

2nd picture CD 33

3rd picture CD 36

What do you all think?