Read Genesis 16:4 Using Other Translations
And he went in unto Hagar, and she conceived: and when she saw that she had conceived, her mistress was despised in her eyes.
And he went in to Hagar, and she conceived. And when she saw that she had conceived, she looked with contempt on her mistress.
So Abram had sexual relations with Hagar, and she became pregnant. But when Hagar knew she was pregnant, she began to treat her mistress, Sarai, with contempt.