Is this Normal? I cant tell if lines are darker or not

Megan
So from bottom to top. Bottom one I took Friday at 1:30 pm. Middle one was yesterday at 2:30 am. Top one was this.or Ing at 8:15 am with FMU. I just cant tell if the pine is getting darker or not. I am really worried because I have had 4 MC before this pregnancy and I'm not sure if this one is going the way it should.