Should they share a room for the sake of me wanting a baby?

[Lovesmypinkones]

Hello I'm having serious broodiness at the moment. My 2 girlies are 10 & 7 and have their own rooms.
If we were to add to our family they would have to share. I'm in such turmoil over weather it's selfish of me to do this to them. (I shared room and hated it)
DH not particularly enthused about having another child but not fully against it either.
Do I carry on with life and get over the broodiness every few months or take the plunge.

Utterly at a loss

Sharing a room is far from child abuse I wouldn't be making that reason why I have/don't have another child if I wanted one and could afford to still give a suitable standard of living