Book 1 of the Oklahoma All-Girl Brands series. 
This is a 2nd edition mass market paperback, published by Harlequin.
Quantities are extremely limited.
 
This is the story of good girl Maya Brand, who has a one night stand with a drifter who's gone the next day, leaving her pregnant with twins. Turns out he's not who he she thought he was at all.
Tropes include: secret identiy, secret millionaire, pregnancy, twins, and a miracle.