The Rancher's Secret Baby — Samantha Price

To inherit his father's money, Jack Southwell must be the first of his brothers to marry. Jack's thoughts drift to Daisy, the mail order bride that he rejected. After she left, she wrote to him saying that she was expecting his child. Not believing her, he failed to reply. What if her words had been true?
Realizing that it is the only way she can keep her baby, Daisy agrees to a marriage in name only. As the weeks pass, Daisy realizes there are more secrets that Jack is keeping from her. Why is it that the harder she tries to get closer, the more he pushes her away? Daisy determines to find out why Jack is so secretive and will stop at nothing to uncover the truth.

Book 2 in the Wild West Frontier Babies is 'The Nursemaid's Secret Baby.'
Samantha Price books are clean reads.