Pregnancy test getting lighter?

Question

So Friday I took 2 test and could see a vvvvvvfl, tested yesterday (Saturday) and the line was dark (still faint) but this morning (Sunday) I tested and I can’t see anything! 
I’m 3 days late and feel like it should be really dark at this point.
Could it be that I used a different brand test or could it be a chemical?

Answer

What happened?

Answer

Unfortunately I'd consider these indents and not positive tests. Which is a good thing in the sense you likely aren't having a loss. Consider that a win in itself.

Answer

It could be a variety of things (pregnancy tests differ, urine could be diluted, etc.), so don’t stress yourself too much. I’m sorry to tell you, it could also be a chemical pregnancy, which I had last cycle. What DPO are you?

Answer

It definitely could be that it's a different brand , have you got any pics hun x

Answer

Clear blue was yesterday and the other is from this morning x

Pregnancy test getting lighter?

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