is it getting darker?

So the top picture was my 9 and 10 dpo. The 9 had sat over night and the 10 I had just taken. 
Same thing with bottom picture. 10 over night and I had just taken the 11. 
Would you say it's getting darker? Since they sit over night they dry and get a little more clear to read right. So the 11 being as dark as the ten after it sat 10 sat all night is a good thing right?