asking for help

Why is it i have such a hard time asking my hubby to help me with house hold chores? My kitchen is a disaster and hubby has offered many times to help if I'd only ask him. today it came down to him telling me he's not waiting for me to ask any more. it's obvious i need help. I told him other pregnant women can do it . I'm sorry I'm so tried so i nap when harry naps. He wasn't saying i was lazy he told me that i am not other pregnant women. i need to ask for his help. But why is it so hard for me? I don't know, it's a mystery.