Verb conjugation of "callarse" in Spanish

I ordered a cab at four o'clock in the morning which took me to the Central Bus Station. I was much to early because the bus would go just at seven o'clock. Anyway I was sitting there and listening to music.
The woman has to decide if she wants to carry the baby or to have an abortion. She is a victim of her own situation, suffering restlessly and thinking continuously about her unwanted pregnancy.
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