Omg. it's only 1:00 on saturday and i'm ready to collapse already.?

i have this problem, well a few actually that contribute to a bigger problem. okay...i work full time, have an 18 month old son, am 2 months pregnant with baby #2 and have a husband who wouldn't know a broom from a toilet brush. i'm soooo tired during the week and just don't want to do housework when i get home at 6, plus i have to cook dinner, feed my son and give him a bath etc... i certainly don't feel like getting up after i eat dinner but somehow i manage to clean up the cooking mess and do dishes. and it's not that my husband WON'T do anything, it's just that he doesn't take responsibility for doing anything and i have to ask him to do things (spelled out in detail)....really he's like a teenage boy when it comes to cleanliness...it's very trying. so...anyway...i save everything for the weekends... laundry, mopping, scrubbing the bathroom etc. and it's just not working. any time management or i dunno any tips at all? help.