I know royal carribean does not allow past 24 weeks. Most airlines allow up to 36 weeks as long as it is not an international flight. Some may require a note from your Dr stating it is safe for you to travel.
I'd be sure to speak with your doctor in regards to any cramping.
Check with your doc, the cruise line if they allow.
It's usually safe to fly until you're 36 weeks, unless you have a high risk pregnancy. Make sure you drink a lot of water and walk as much as possible while in flight. Of course clear it with your doc first.
Have fun
Is getting cramps while ur prrgnant is bad
Check with the cruise line as well, most have strict policies about traveling while pregnant.
That's a great question for your doctor. They know your situation better and can advise you