I bought these and they taste great. A Mexican buddy of mine at school let me have one and I was hooked. The only problem I had with these is that is was the Aldama brand and not Las Sevillanas but it is still a great tasting Oblea with cajeta and I plan to buy again.
The hook effect and false BFNs. Summarised, the hook effect is when someone continuously gets negative urine and blood tests but are actually pregnant. It happens because hcg levels are too high to register and is common with mothers carrying multiples or on older woman.
Fun with pee sticks - Hook Effect. I'm stuck on bed rest for a subchorionic hemorrhage and have too much time (and too many pee sticks) on my hands, so I thought I would play around with some. At 7 weeks I've just started to see the hook effect happening. For reference, my beta was ~12,000 at 5w2d and ~20,000 at 5w4d.