Starting to get uncomfortable

I stay at home with my 2 yr old and I am almost 36 weeks pregnant. He goes to preschool three times a week half a day so I do get a little break. I fill up my time by getting things ready for this next baby. I have bought everything and have done everything including painting the nursery, getting furniture in..EVERYTHING. I have been doing it so my husband can focus on work. I cook, clean, do the laundry- EVERYTHING. Needless to say ’m getting really sick and tired of the attitude at night when I need help bathing my son and putting him to bed. He doesn’t understand that by the end of the day- I am sore all over. My back is the worst and it is extremely difficult. Tonight he gave me attitude when I volunteered him to put our son to bed. Should I be annoyed or am I overreacting?