Rooming issue

I just had my first baby. My fiancè has 2 sons. One is 3. The other is 16. My baby is a girl. I was molested as a kid so I don't want my daughter in a room with a step sibling of the opposite sex. I know he's only 3 but I think it makes sense the only girl gets the room. Boys share a room. My step son had a fit about possibly Sharing a room with a 3 year old. My fiancè took his side. Saying there is too much of an age gap. I said I don't want my daughter bunking with a boy. My step son says that this has been his home for 10 years and that I don't get to show up here, get knocked up by his dad and change everything. My husband did tell him that's disrespectful and he apologized later because my husband forced him to. Wasn't sincere. My husband said he's going off to college in 2 years. Baby will be in our room first year. So when my daughter is 1, his youngest will be 4 and that they can share a room for 1 year together. I asked why his son can't share a room with a 3 year old for one year but he has pretty much completely taken the 16 year olds side and said he doesn't want to hear about it anymore from either of us. My husband said only other option is she stays in our room until his son heads off to college but he's not having this fight anymore. I feel like my feelings are not being considered.