Travelling @6months pregnant on the train with 3 kids under 5

I live 7hours away from my family and I've been planning on go to visit my family for a while but I just don't think that I really should.. Money is tight since we've been saving up for new baby and maternity leave. That's not my biggest issue I just dnt wanna put myself under more stress than I need to. My family is really looking forward to me going and it's not that I dnt want to I just don't think it's smart for me to go right now. My husband insists that I go cuz he think I will complain later but he just doesn't know how stressful this train ride is by myself.