Confusion

Hi! How far along are you now since your ODD? The pregnancy tests from the store react to hCG in urine (but only show positive or negative), while blood tests detect hCG in blood (and give a value). But if a too-low concentration was found in your blood (for now), it's normal that the concentration in urine is also too low to detect; but more sensitive tests might pick it up already.
The hCG concentration doubles every 48-72 hours, so if you take another test after that time, you might get a better picture. A blood test always gives the best picture, so I'd try to be patient until Monday.
In blood, they effectively measure a value, so comparing Monday's value with the previous one can tell you more. A (more than) doubling usually means the cells are implanting well, while a lower difference can indicate an impending miscarriage, and in that case, blood will likely be taken again in a few days to check this.
Good luck with the waiting...

@Lore blood tests also measure values under 10, so too low for a urine test. So if the urine test indicates positive (above 10), you'd expect a blood test to also show positive. Maybe an early miscarriage?

We often see values between 5 and 25 at the lab, which we report as “uncertain – retest in a few days”. From 25 onwards, we report positive, and below 5 is negative.

These uncertain values can go in two directions after those few days: indeed, they might not have risen or even dropped, indicating an early miscarriage, or they might have nicely doubled, meaning it’s effectively a pregnancy.

I assumed that in this case such an uncertain value was measured, since she has to come back on Monday for a new test. It’s really not that exceptional but understandably causes a lot of confusion. And that different urine tests show slightly different results in this case doesn’t seem that bizarre to me, but it is confusing.

@lore so it's still uncertain between 10 and 25? but it is indeed visible with a urine test

Yes, every blood test between 5 and 25 is requested to be redone to make sure that implantation is going well. Many miscarriages happen exactly at this stage of pregnancy, but this is usually before most women even know they are pregnant, because they really settle around the expected period and don't usually get tested that quickly (with a blood test).
And usually that value goes up nicely, but just to be sure, this is monitored closely before you get to make someone intensely happy with a positive pregnancy confirmation .
I don't know much about urine tests, those concentrations are unfamiliar to me, I assume that just gives a faint line? And then I see on this forum that the test is often redone to see if the line gets darker, so it comes down to the same thing.

@lore early tests are from 10 hcg and regular ones from 25 hcg

Do you know more about Sofie yet?

So conception and implantation did take place (hence your positive CB and Kruidvat test), but unfortunately, it didn't work out in the end because the Kruidvat test now shows negative
I think you're going to get your period (late).