Mandyc

In the days of tendering at Coco Cay, the waves could be an issue (we missed the port once).  Now it is less of a problem with the pier.  Twangster has already given you a weather update.
I have never gotten sick on a Royal ship, but a couple of times the seas were rough, and bags were hung in the staircases.  I can't remember the last time that occurred to us. 
Have a great trip!

windy.com for wind forecasts.
Last week there was a strong high and strong low that combined to create a wind tunnel effect between them through the Bahamas.  That was last week.
This coming week looks pretty good.  
I think you'll have a great cruise.
  

The easy answer is to say, don't worry about it.  The cruise lines are in business to get you to spend your hard earned money on a fun and rewarding trip to places you probably wouldn't ordinarily go to.  They are all pretty good at that.  While there is no doubt that I also look at the weather ahead of time, RCCL has staff meteorologists whose only job is to ensure your safety and comfort on your trip.
The Voyager class, Navigator included, are wonderful ships.  You've done the hard part.  You've saved your money and paid for the trip.  Now, go have fun.  Next time, book a 7 day.  You will like that even more.