If the doctor took a sample of the amniotic fluid he could tell. Because there is DNA in the amniotic fluid. But someone can usually guess at 16 weeks on an ultrasound and 20 weeks a person can usually tell for sure. kittenbrower Â· 9 years ago.
1 Pupusas Revueltas have a filling made of a mixture of cheese, chicharrones and refried beans. 2  Pupusas de Queso y Loroco have a filling made of a cheese and tropical vine flower (Loroco).
A variant of the pupusa in El Salvador is the pupusa de arroz. Rice flour is used to make the dough and they are usually stuffed with chopped pork, cheese, beans, zucchini, and other vegetables.