I called clearblue helpline today after getting a 2-3 on their digital when last week I had 3+ (I know, I shouldn't still be testing but after multiple miscarriages, the anxiety is crippling).
The lady on the helpline told me that once you get a 3+, you must stop testing. They are not designed to read higher than a 3+ so when HCG becomes a certain level, the test will not read accurately as it cannot interpret the levels.
Just thought I'd put this out there for anybody else who is worried or is stressed regarding these tests.
I have a scan tomorrow, I'll be 6w1d and I've promised myself and my bank account, no more tests.