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"Preñada" is a form of "preñada", a noun which is often translated as "pregnant woman". "Encinta" is a form of "encinta", an adjective which is often translated as "pregnant". Learn more about the difference between "preñada" and "encinta" below.
la preñada
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (colloquial) (general)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. pregnant woman
Había una preñada en el autobús que parecía que estaba a punto de dar a luz, pero nadie le cedió el asiento.There was a pregnant woman on the bus who looked like she was about to give birth, but no one gave up their seat to her.