This is not your problem, it is your husband's problem. You are pushing out his baby, and he is telling his family to back off and respect your space. I just think that anyone who would think it is reasonable to 'tell' someone they are staying with them so soon after having a baby is not the type of person you want to have around at that point.
Bottom line is, you'll be pumped full of hormones, MIL will do something to p!ss you off, you'll either go bananas or burst into hysterical tears and there'll be a fight that will just ruin everything. Not worth it for any party.
And yes, I'm projecting. You may be more able to deal with this than I am, in which case, I'll shut up and just read what you have to say.