Ay, mahirap talaga yan sa 30 weeks, mama! Honestly, most of us na preggy at that stage avoid it kasi the rocking and long hours sitting down can be uncomfortable, plus if anything happens out at sea, it's risky na. Better check with your OB muna bago mag-commit, lalo na kung mahabang biyahe or malalaking waves, bawat pregnancy is different din, at alam ng doctor mo best ang condition mo!