I'm going to ask him not to smoke pot while I'm pregnant
What's wrong with smoking pot while you're pregnant?
I don't want my baby getting high and there are bad health effects.
It's good that you are proactive about protecting your child from potential harm. In this case, it is easily do-able by asking your partner to eliminate their marijuana usage around you.
Well, he might end up dumping me, maybe I should just keep my mouth shut.
No, I think you need to stand up for your baby. Your baby has to be more important than your relationship. I really think that you'll be a great mom!