For the DP, you should be just fine since it's supposed to start on your BWV check in day. We've done split stays with 2 DDPs and we had to use up all the credits on the first before switching to the second. You only have one plan so you should be fine. I'd recommend checking out at the desk at POR. They can call BWV and let them know you are coming. It probably won't get you a room any earlier, but it should help make things smoother. They should also be able to verify that the DDP is active and ready to be used.