How accurate are Clearblue digital weeks tests?

[Rosabuddy]

I am 14-16dpo and have a positive test reading 1-2weeks. Should I be at 2-3weeks by now??

They date from implantation where as we normally date from last missed period. So expect them to be about two weeks out. So when you date as 5 weeks you might get 2-3. But they are also notoriously bad as hcg levels vary and can cause unnecessary worry.