Inpatient for mental health while pregnant- CPS

Has anyone ever been inpatient on a psychiatric unit while pregnant? I suffer from PTSD and depression/anxiety. I've had a good grasp on my mental health for a while now. I experienced some post partum with my son but seeked therapy and everything had been great.

A couple weeks ago I got some unsettling news in regards to my sons health and development. I'm currently 20 weeks pregnant and I'm feeling incredibly overwhelmed, emotional, and honestly pretty awful. Some days I want to just run away or disappear, I'm having a hard time coping and coming to terms with my sons diagnose. I feel like I'm having a hard time functioning and at times I feel like I would benefit from going inpatient for a week to get my head and thoughts under control.

I'm just worried about repercussions for doing so. Would CPS have to step in because I'm having a lapse in my mental health? My child is always well taken care of and if I was to go inpatient my fiance would be there for our son as well as my parents. I'm feeling conflicted as I want to get into a better headspace so I can be the best mother I can but I also feel like it makes me a bad mom for potentially leaving my child for a week to do so. Does anyone have any advice or suggestions or been through something like this?