Wow!! That is the perfect sway! There are never any guarantees. Even if you get your dg, there are still no guarantees that she will be the "daughter of your dreams". Brothers is very special and you will love being a mom to two boys. Once the baby is born, you won't want it any other way. Most brothers have a special bond, too.
By the way, congratulations! Wishing you an easy labour of a healthy baby boy and a quick recovery.