Re: Motion sickness medication while pregnant
I'm not sure about the over the counter stuff, but your OB can write you a prescription for promethazine. It's for nausea and my OB gave it to me when I went on a cruise during my last pregnancy.
You can also try Sea Bands - most pharmacies sell them and they use your pressure points to control nausea, but I've never actually used them so can't speak to their effectiveness.
Regardless, you should consider how rough the boat trip will be. If its just a sail that's fine, but speed boats are probably off limits.