I’m not a smoker but my fiancé is

So I’m not a smoker at all and my fiancé smokes cigs . . We have a 4 year old and I’m currently 9 weeks pregnant . It never bothered me too much before because when he’d smoke it would be in our bedroom with the door closed and our son would be in his room . He doesn’t always smoke in the room either if he’s around the house he’ll go out side . But his brother and mom comes over and they smoke in our room a good bit ! . But I find since I’ve been pregnant I feel like I can barley breath from the left over smoke at times . And my senses are so much stronger it’s bothering me so much !! Am I wrong for wanting to tell him his mother and brother that when they come over they should smoke out side period !! Not to mention I don’t like it around our son either but he says he’s in his room it’s not going to bother him but it’s bothering me . I’m pretty sure my fiancé would Totally be okay with that I just haven’t spoke up yet. !btw we will not be in this house when the baby comes we’re moving into another home that will be smoke free in a month !! So that’s a plus it won’t be around any of us .