When should I go on leave???

Jessica • First time mom! Excited for our little boy too get here may 31st! 💙💚💙
I originally told my boss I wasn't going to leave until May 24th, but my dr changed my due date to May 27th. I really don't fee like I can keep doing this. I'm a CNA and I feel like crap all the time. What should I do? Stick it out or leave my job?