Mixed emotions

I'm feeling some distance between my Partner and I which I want to address but he doesn't respond well to such conversations because he takes it as an attack and then avoids me for a few hours even days. Since last weekend he has been really off not saying much to me, staying out and during this time I have been suffering from severe migraines due to pregnancy whilst looking after our toddler. I tried to explain how I'm feeling and he just ignored me, not once did he ask or check up on me nor did he help out with our daughter. When he is sick I'm there for him helping out where I can and I make sure he is okay, I don't even get the same level of care in return. To make matters worse we are supposed to be putting the deposits down for our wedding day this weekend and right now I don't feel like I can commit to a lifetime with a man who treats me like I'm not even a priority. If I bring this up he will stay out for days because he doesn't want to be at home when there's an argument waiting to be had, which to me makes him sound like a child. I'm pregnant which means I'm hormonal yes but am I being unreasonable?