lines not getting darker?

Karissa

So I have taken first response 3 mornings in a row, and the line takes a good 30 sec - 1 minute to show good. and it's not getting darker. AF is due today and I am 14dpo today. is this normal? I would think by today it should be instant and blazing! does FR only have one shade??? Lol

12dpo

12dpo

13dpo

14dpo