I’m so angry for no real reason

so im 36 weeks into my first pregnancy, and i’m on mat leave already which has somewhat helped with my stress levels, but i’m just finding everyday i feel so negative. My partner is working 60+ hour weeks at the moment picking up loads of overtime and is out for 12-14 hour shifts at least 6 days a week and i just feel so lost and alone. he is fantastic when he is home, and works through my feelings with me so i feel so guilty for feeling hateful, but i cant help just feeling negative. i cant be bothered to cook and clean, i just sit and cry all of the time while he’s away and just want to nap constantly. i haven’t really let him know how bad it is because i know he’s already stressed out with work and money etc and taking on the brunt of responsibility. i hate being pregnant, i hate feeling this way and i just feel like a fat waste of space.