Was this baby planned?
If he is working long hours he could be feeling trapped and needs to be reminded that this is a team effort. Talk to both your extended families about how to better support him so that he can reconnect with you and begin to enjoy the new life you have started.
If it turns out that he wants out then that should quickly become apparent and you will be able to address the issues behind that and either make things right or get sorted out well before the baby is born.
All the best, hopefully he's just stressed.
Could be either but something definitely isn't right