As said by a PP, construction in a resort has no bearing on your odds of getting what you booked. We didn't get what we booked at CSR this past February and it didn't have a thing to do with construction. It's always possible. I don't believe construction makes it any more likely. From what others have said they did see the construction notice near the time you booked so either you missed it or it was put up days after you booked. In either case, they knew the construction was coming and would plan accordingly. I wouldn't stress over the room. Odds are extremely high you will get what you book and if you don't, they'll make it up either by refunding you or giving you a better room.
And to be clear, you booked a room category not a specific room. Have you looked now to see if rooms are still available for your dates? If so, you have nothing at all to worry about. And remember, check full price, not promo. Promo rooms are limited. Full price will give you a better idea of inventory. And even then it's not 100% as they put out blocks of rooms to places like Orbtiz or Cheaptickets and will return to the Disney inventory at some point.
And you are looking at a
DVC which is even more different than the regular rooms. Did you rent points or pay cash to Disney?