Hi Maximus, I did one at 12dpo and got 1-2 weeks then. However, I’ve since seen quite a few posts about them which has put me off doing the second one in the pack.
There are a lot of people who have had HCG levels at several hundred or 1000+ who just aren’t getting the progression on them. There are quite a few people calling for them to be banned, as it has caused undue stress in the early weeks - but then they have gone on to have healthy pregnancies.
So don’t worry about that at all! They’re not meant to be that great for reliability. If you want to see progression, use cheapies or some pink dye tests.
I’ve decided to stop testing altogether now for my own sanity