How have you ladies dealt with your first big post-pregnancy argument with your SO/Coparent? I know…

How have you ladies dealt with your first big post-pregnancy argument with your SO/Coparent? I know it sounds like a stupid question but we just had an argument that got to the point where my SO is talking about leaving (not just for a few hours either, we're talking like the rest of the week and not talking to me ) and I know that we DEFINITELY can't handle things in the same manner we did before/during my pregnancy and I know that we're both still adjusting to new life as parents and both beyond tired and sleep deprived and have a lot going on emotionally and stuff so I'm trying not to let it get to me but it's really hard and there's way more to the argument than either of us are saying and I want to refrain from arguing and having tension with the baby around which is hard when she's always in the same rooms as us when nobody else is home to watch her for an hour here and there.