Selfish or understandable?

I have been having this internal fight since I found out I was pregnant. The plan when we bought the house was that we would all (by all I mean us and father in law) would live in the house for two years, then separate, however that was to work. Well obviously things have changed quite a bit. We really didn't expect getting pregnant so soon, in fact we'd thought we'd just now be starting this adventure, but alas that is not the case. So for a few months now I have been doing this dance between my rational thoughts, my needs, my wants, my independence, my love of my family, and of course, my intense hormones. Let me tell you, not easy to be rational or selfless while driving on pure emotion, AND I was already pretty passionate with emotion prior to baby. But now, I just feel bipolar. I want so bad, more then anything to be alone. To live alone, to have a life to myself (and by myself I mean with Aaron) and to start this family in a harmonious way. NON of which I have at the moment.
So baby is not due for another 4 or 5 months BUT I want time to ourselves, to get our budget square and most importantly to have some alone time before D Day. So I ask, is this selfish or understandable? It is half his house so I feel like I can't kick him out, but the resentment is starting to set in. How come he doesn't want to move out, let us have our own space? And I'm not always nice WHICH I HATE. He doesn't deserve that, however I can't help it. I want things my way. I'm a homemaker and I treat my dog a certain way, I don't feel that is out of line, however he does things completely different. So we have this talk last month, "move out or we move out" type thing, then I got over it. Having a really good cry, and by cry I mean hyperventilation, and pulled up my big girl panties, and I dealt, and it's been fine. I have known due to my husbands reassurance that he'd be gone around May. OK awesome, I can do that. Leaves me two plus months to get things together. Not perfect but it will work. UNTIL TODAY! He's leaving on a month trip. NOW, at the beginning of April. So what the fuck is going to happen when he gets back? How is he going to find a place to live? And if we were the ones to leave- which I feel we shouldn't have to do- why not say something sooner? I would have already found a place. Honestly! And although I should be ecstatic that he's going to be gone, I can't help being SO upset that when he gets home, he will still be sitting on the couch. He has not even brought up the moving subject since our talk. He doesn't seem to be in any hurry. And do I have a right to be upset...I honestly don't know. I can just see it, it's July and he finally moves and then I'm 8 months preggo and not able to do any of the things I want to do...like paint a nursery. Which I feel I should have a right to do. This is why I bought a house. And he doesn't like this house, I do- for the time being. I don't want to make things uncomfortable but I'm so unhappy. And I really don't know if I'm being selfish and just pregnant or if I have a real reason to be upset. We did have a deal but on the other hand, his son and wife are expecting their first child and have never ever lived alone. And all I want to do is crawl into Aaron's arms and he take care of it, but how do you kick out your dad, from his house? And he's not even home to vent too, which is hard too. It is his dad, I'm sure he's sick of the venting. I feel very alone......