15 weeks pregnant with a 1 year old

My marriage is crumbling around me. Married almost 4 years to a foreigner so there are definite cultural differences. The stress of being parents has really gotten to us and is taking a toll. I don't want to have sex with my husband because I don't feel connected to him. He works like crazy and whenever he is home he's glued to his phone or the tv. He's upset because I dont want sex and when we have it I'm uninterested. I don't know how we can change things and become connected again.