Moving during pregnancy/with a newborn..

So my fiancée and I have been looking to buy a house with cash on the cheaper side. We found one we really liked and put an offer in, and it’s a beautiful house! He’s a contractor so any home remodeling, he knows what to do. I’ll be 20 weeks pregnant on Sunday and am okay with the thought of moving. But my fiancée wants to take this house, fix it up, and flip it. Which I am okay with, but he wants to move in for a month, fix it up and put it right back on the market. I am completely unsettled with this because I want to have everything settled and ready for when the baby arrives. Moving from house to house makes me feel nervous. Not only that, but we haven’t bought ANYTHING yet, which also upsets me. He didnt want to buy anything until we find out the gender(we find out Monday!!) and now he wants to wait even LONGER until after the baby shower to buy anything..

Between not having ANY baby supplies, and moving around houses while 20+ pregnant more than once, or with a newborn, I am so completely stressed out.

I just needed to vent. Any suggestions how I can talk to him about this? What do you ladies think?