Hi im.only 7weeks at the moment with bad nausea thats about it. I just called rhey said they can moat likely give a refund or credit voucher if i provide a mddical certificate they take pregnancy vwry serious. So im gonna go speak to my gp of by chance i cant get one im going to go ahead with it.
I'm planning a p&o cruise for the near future and thought the same. Give P&O a call and ask them. They have a medical clinic on board abs I'm pretty sure if you've been traveling well so far that their shouldn't be any problems unless by the time you go on you're entering your 3rd trimester.. Then they may be concerned. Also travel insurance may help.
You shOuld be fine your pretty early.
Check your travel insurance too.
Talk to a doctor. Also check with the cruise company.