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.
There is a 1 in 200 chance it will occur and usually hapens in very young women or women who are almost finnished their reproductive years. Basically the Dr. need to give an ultrasound to find out if the women is actually pregnant or dilute the blood or urine test to give a lower hcg level. hook effect. **.