Clear blue digital tests only go from when you conceived not from LMP.
Your period tracker will take you from LMP which may show 6 weeks.
This is what it shows for clear blue digital so it sounds about right.
"2-3 weeks" result on a Clearblue digital pregnancy test means conception occurred approximately 2 to 3 weeks ago. This is calculated from the time of conception, not the first day of your last menstrual period.
You arent actually pregnant for the first 2 weeks as you have to date it from the start of your LMP.
You bleed for a week, another week you ovulate.
Which will show you being around 4 weeks pregnant.
The tests will only go from how concentrated your urine is.
If you drink a glass of water an hour before you test it will dilute you're urine and show lower HCG.
You just have to wait for a scan, if you have any issues speak to your GP and see if they will refer you to EPAU, they will only scan you from 6 weeks some only scan from 7 weeks for better results.