Pregnant By the Billionaire

Mia Harper is out of luck and short of money when she agrees to marry Carter Prescott, a wealthy CEO. The marriage is a contract that serves each of them, on the condition that neither develops feelings. Mia and her stepmother move into Carter's house. Carter sees her design work and hires her at his company, which he had not planned to do. The two of them break the condition and start caring about each other. Carter's ex, Lily, comes back and stops at nothing to win him back. Other people with an interest in one or the other of them turn up as well. Mia finds out she is pregnant with Carter's child. Then she finds out who she really is, and that Lily is the stepsister she lost long ago.