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.
1 The test is susceptible to the high-dose hook effect at an hCG concentration somewhere between 400,000 and 600,000 IU/L. 2  This means that when a sample with an extremely high hCG concentration is tested, the result can be falsely decreased.