Is it normal to feel completed wiped out?

I’m only 7 weeks along with my second pregnancy and this one is really taking a toll on me. I’m sure having a 2 year old adds to the exhaustion but I’m feeling so weak and depleted each day it can be hard to function. My husband is such a huge help when he’s home from work but it’s still difficult. Between the waves of nausea and hunger, the exhaustion, I’m constantly thirsty no matter how much water I drink, and just down right weak. Anyone else this worn out this early? Is this normal?