Evap line.

Brooke • Newly-wed and loving it <3
I took the test this morning after being about four days late on my period. 
I checked it about five minutes after, no line. Checked it after work, line.
I know about evaporation lines, but can they be this dark? Just wondering, please give your advice and or experience!
UPDATE: still no period, and I'm on cycle day 42. My cycles are usually 35-36 days long. I plan to test agin if it hasn't arrived by this week. I'll keep updating, and if you have any experiences I'd love for you to share!
FINAL UPDATE: 
1) my period came...2 weeks late! I started a new job last month and my sleep schedule has been off wishing threw my whole cycle off. Changing your habits really does effect your body! Learned that.
2) this was a faulty test. All around weird, that's not an Evap but it also isn't a positive. 
I hope this post can reassure some who are looking and freaking out about maybe being pregnant. Baby dust to all the TTC! 
Much love and thanks for everyone's advice.