30 weeks and ready to quit

So I'm 30 weeks on Wednesday , and I just feel like I can't anymore. I planned to leave work when I was 36 weeks. Which was early as is.

I wake up at 530am and work until 3pm at a hotel. I hardly stand or do anything that difficult. But I also have a 2 year old that I care for afterwards.

I just feel mentally drained. I'm crying almost everyday , I'm so tired .. I feel like I'm just a walking zombie.

I was thinking of doing the rest of this month that will put me at 33 weeks, and going on maternity leave.

I'm in Ontario so we get 18 months now. So I feel like going back to work at 16 months won't be that much difference from 18 months

Idk I'm I just being a baby ?

When did you guys go on maternity leave. Don't tell me if you made it until you had baby. I don't want to feel even worse lol