I agree with PP's, I think that educating him his the best answer here. I would tell my DH all the stuff that was happening like "my body is producing ___% more blood this week which is causing my kidneys to go into overdrive which is why I have to pee all the time" that made sense to him and didn't look at me strange when I have to stop and pee every 5 mins anymore.
Also, when he found out that like I was literally growing a brain inside of my body, etc. etc. he was kind of like "holy crap, I can't believe that you have a tiny heart and a tiny brain inside of you" There's a lot of stuff happening in our bodies and it is totally legit for us to be peeing/puking/sleeping all the time. GL!