Sometimes it takes very little for an author to ruin a story for me. Really bad research will do it. Total disregard for reality will as well. In this case, it came at the very end of the book when the heroine feels her baby move for the first time. The hero immediately puts his hand on her stomach and feels it too. Pul-lease.
This was the first of Ms. Brown's books that I've read. It's also the last.