Liz knew that Stephanie had prenatal check every month.

Stephanie stayed obedient because of Jack's threat. Jack was protecting her so well that both Liz and she couldn't find a chance to abort.

In July, Jack had laid down his guard and allowed her to go have prenatal check on her own. This is a chance for Liz.

Stephanie planned to go there on a cab because she knew Jack would not drive her there. Though he didn't send people to watch her, there could still be his men in ...