I’ve had three babies. I know it is just short of being a year of feeling like your body and time are controlled by someone else. You eat different, you sleep different, and so on.
It is rough for the men too.
One minute he can look at you and see a beautiful woman who is going to bring his child into the world. A minute later he might see you as a gigantic pig, and wonder why he ever hooked up with you from the start.
Most men are confused about what is going on in your head and body, how they should behave around you.
If he is only looking, then let him have it. It can give him a sense of normalcy.
If he is doing more than window shopping, you should have a talk with him.