Married 2 years

So I’ve been married 2 years and I’m 7 months pregnant with twins, and I feel like lately my husband doesn’t want to spend time with me anymore. I really only get to see him Friday nights and Saturdays due to our work schedules and he has volunteered for a haunted house on Friday nights and Saturdays. I just feel like he’s losing interest ever since I got pregnant. He said he’s not and loves me but I just feel like our marriage has lost its spark. I’m not sure if I’m over thinking because of hormones or if that’s what’s really happening. Any advice?