Need Serious Advice

I am in between a rock and a hard place. My baby’s father is trying to move in with me without telling me he wants to move in with me. A few days ago he was telling me that he wants to bring some of his and his sons stuff over(he has custody of his 6 year old son) so when the baby gets here he can help me out. Okay fine a few things. Let me go back a little bit before I get to the real point. I’ve been sleeping alone waaayyyy before I was pregnant and while I was pregnant. Yes he would come over on the weekends and leave Sunday morning. I was okay with that because I’ve grown accustomed to having my own space for a while without a man. Me and my kids have lived without a male(other than my two sons). Now let’s speed up to today. He tells me that he wants to bring his king size bed(he doesn’t feel comfortable in my bed) and dresser over so we can sleep in the king size bed and his son and baby can sleep my queen size. The light came on(in my head). As much as I wanted to burst out “hell no” I kept my composure and calmly said “ that’s okay. My room is not that big first off and so I can imagine how my room would look if he did come with his king size bed and my bed. I understand he wants to be close to his baby. But living together is a big no no with me. It’s not that I don’t care about his feelings, but I have gotten used to doing things alone. I really need to know how to tell him without being rude or inconsiderate. We haven’t even made it fully official if we are even together yet.