Irritated!

My fiancé and I had to move out of our apartment due to construction and just so many issues. The day before we move, we found out we are expecting a baby! We are currently at his parents house with his 24 year old brother and our 2 year old daughter in a 3 bedroom home. I hate being here and I am ready to move NOW. Especially being pregnant and irritable. I need my own space and he seems so comfortable with living here for as long as forever... Am I over reacting? I'm thankful we have somewhere to stay but if we can afford to move, then why can't we just do that??