And they shall turn back and shall come to En-Mishpat; this is Kadesh; and they shall smite all the field of the Amalekites and also of the Amorites dwelling in Hazezon Tamar.

Judah got a wife for Er, his firstborn, and her name was Tamar.

Then Judah said to his daughter-in-law Tamar, “Remain a widow in your father’s house until my son Shelah grows up.” For he thought, “He might die too, like his brothers.” So Tamar went to live in her father’s house.

Tamar was told, “Your father-in-law is going up to Timnah to shear his sheep.”

And it will be after three months, and it will be announced to Judah, saying, Tamar thy daughter-in-law committed fornication; and also, behold, she conceived by fornication. And Judah will say, Bring her forth, and she shall be burnt

Later, when it was time for Tamar to give birth, she was carrying twins in her womb!