We went on an Alaskan cruise in July and I was 6 and 7 weeks pregnant at the time. The 'morning' sickness I had all day was only made worse by eating in the dining room with all those smells combining and the rocking of the ship. At the time, I never even thought about not sailing because I was pregnant so I don't know what Celebrity's rules were concerning pregnancy, but since I was so sick at that point, I was losing weight so you wouldn't have known I was pregnant then anyway. We went to WDW when I was 19-20 weeks and you couldn't tell then either, unless I wore something very fitted, so had we cruised then, the cruise staff wouldn't have known either.