I chart and do OPKs and use a fertility monitor and POAS early and often.

So I was 10 DPO when I got a super squinter with FMU on a Wondfo on Monday. A few hours later I had blood drawn for a beta HCG and got the results back - my HCG was 5. 5 people! That means that a Wondfo picked up on a level of HCG that my doctor said is barely on the borderline of pregnant. I think these tests are far more sensitive than they let on! My doctor was super impressed - she said "you must have been using some super expensive early result test, huh?" And I was like "no! This was an Internet cheapie!" She was blown away.

Attaching a pic of the super squinter so folks can see what an HCG of 5 looks like on a Wondfo! (And honestly it was hard to see - just a shadow of a shadow in real life.)