His Heir, Her Secret by Janice Maynard

For two glorious weeks, Cate Everett shared the bed of Brody Stewart, a man she'd just met and never expected to see again. Until she discovers she's pregnant. Fast forward four months, and the seductive Scotsman is back in town…with the solution to Cate's baby–to–be dilemma. But if she becomes Brody's bride, will she be living a loveless sham? Or will he throw his heart into the bargain?