Look here under “Read your result”: https://uk.clearblue.com/pregnancy-tests/digital-with-weeks-indicator
Please ignore the weeks indicator - it is SO unreliable. I know so many people that have NEVER got a 3+ throughout their whole pregnancy x
I believe the indicator is for weeks since ovulation/implantation, not since your last period like official weeks of pregnancy are counted. So if you are 6 weeks since the start of your last period, that would mean about 3 weeks since implantation. So it sounds pretty normal. Otherwise that wouldn’t even be possible to show 1-2 weeks, as you’re technically not even pregnant at that point (haven’t ovulated).