Leaving my baby for two/three weeks

So I want to start with I have a good relationship with my in-laws for the most part. Thing is, they’ve been talking about taking my 18 month old son back home with them to San Francisco before I go into labor.. we live in southern Orange County. Nothing has been said to me directly either. They just talked to my husband about and he just said I was fine with it like wtf. I want my son to meet his little sister when she’s born. I think it’s horrifying for him to leave us to stay with his grandparents for two weeks and come home to this tiny baby. He doesn’t fully understand and no one is regarding his feelings at all. I also want him home for Mother’s Day like I figured that’s not much to ask for. They’re treating him like he’s a huge inconvenience to me but he’s not. I want breaks from him, but not two weeks straight like what in the actual f*ck. Maybe it’s my hormones, but I’m kind of upset about the whole thing. I’m also about to give birth extremely soon. I’m hoping my body waits till at least after May 16th. Again no one tells me anything! I hear it through my husband and I told him how I felt and what I’d like instead and he said that it has to be on their time because his mom works, but his dad can take care of him just fine and at this point it’s not even a favor. My mom can’t either because she also works a lot and her only off days are Saturday. I don’t know what to do. I’m extremely upset and overwhelmed. The cherry on top is my husband and I had this discussion he got his feathers all ruffled and just said I’ll tell them to cancel and that you changed your mind in a bothered tone.. which set me off because?? Tf!! I was never directly told about this!!! HELLO?? and afterwards he just went to sleep and didn’t help me with our son. He claims to have a huge headache now. I’m in early labor… I’m currently 5 CM dilated… this is our second baby and I don’t plan on having more till I see him act right consistently. This pregnancy was crazy rough. I’m pissed tf off