What did Hagar do to Sarah when she was first pregnant?
When Hagar first became pregnant, she taunted Sarah and made her life miserable, boasting that she was pregnant while Sarah could not be. She kept provoking Sarah until Sarah went to Abraham and insisted he get rid of Hagar out of her sight.
Les explains that when Hagar was first pregnant, before she had her child, she began taunting Sarah, making life miserable with the boast, "I'm pregnant, you can't be." Sarah finally couldn't take it another minute, went to Abraham, and demanded he get rid of Hagar and send her out of her sight. Abraham did send her away, but God intervened in the desert, sending Hagar back to Sarah's tent, knowing that thirteen years later He would tell Hagar and Ishmael to go right back to the desert.