Married but i feel like a single mom!

My husband works 6 days a week 12 hours days he comes home and just wants to eat, shit and sleep.. 😒 im 22 weeks pregnant with a boy also with a 4 year old boy at home 24/7.. i feel like im doing it all alone and he just cares about bringing in money for bills which honestly is not bad but i do need some attention and my son does as well. He is not my first sons biological father [hes been there since he was 4 months old] and I've heard my son call my husband by his name a lot lately instead of daddy.. i feel like he also feels the distance. I don't know what to do anymore I've spoken to him A LOT ABOUT HOW I FEEL ABOUT THIS SITUATION and i feel he doesn't care. I also told him ill leave him and take my kids and i feel he doesn't take me serious. I've done this single parent life before alone with my first son so its not that I'm scared of doing it again i just feel now that we are married i shouldn't have to.

What are ya'll opinions?

Am i exaggerating?

Or am i in the right to be upset?

Should i walk away?

Or keep trying to fix us?

Sorry but i had to vent.