Need more eyes and some opinions please!

Li

I posted a pic of my vvvvvf hpt at 8dpo and everyone said they could see something or the start of something. I’m now 10dpo and the line isn’t any darker, seems like I have to work harder to see it. Since hcg doubles every 48 hours shouldn’t it be more clear now? The top two are today (10dpo) and the bottom is 8dpo.

10dpo

10dpo

8dpo