My doctor said you should be getting up frequently when on a plane to prevent blood clots so im sure you'll be more then fine.
Well, as a last resort there are disposeable adult incontinence products to consider using.
Im33 weeks and i am the xact same, ill pee then come to bed then need to go straught away again unfortunatly theres not much you can do, baby can be pushing on your bladder witch is making us constantly pee so theres not much we can do