Help!!

So my husband and I will be married 3 years in April we have 5 children not all together we are a mixed family and 1 on the way in the last 8 months I have felt very disconnected from him like I dont even like to have sex with him I have no desire at all I love him with all my heart but we fight alot about it among other things and divorce has been brought up multiple times I'm a stay at home mom my 14yo and 5yo go to school during the day and I'm home with the 1yo my husband works about a hour ans a half away but doesnt makw the drive during the week cause he has to be at work by 430am supper early so hes only home on the weekends idk if it's the stress of being a "single mom" I deal with all the kid issues or if my Marriage is falling apart I need some advice on how to get the heat and love back