That’s an evap type line, they say for it to be a positive it needs to be a solid line, I did many of these and had the same line until I was actually pregnant and it was a solid line like the one that goes across. If your breast feeding that could be a cause for not having your period yet.
This is how mine looked and was positive.. if I'm.honest I brought 4 different brands one being the digital clearblue.. 9dpo all positive. I would test again. X
Go and get a blood preg test from your local sexual health clinic xx
clear blue are notorious for false positives. try with a pink dye in the morning as if you are pregnant, may not be strong enough to pick up on the digital yet.