If you are prepared, you should have a wonderful time. Normally when an island is hit very hard by a hurricane, they will substitute a different port. With all of these Hurricanes around this past few weeks, many cruises are visiting places they never intended on going. Some (most) that booked the Eastern Caribbean ended up in the Western to avoid potential problems last week.
Hang in there and just go with an open mind. You will get to visit some ports but it just might be a TBA (to be announced) thing as the first and highest priority of the Cruise line is to keep their passengers safe.
And enjoy that first cruise, you will love it.