Early maternity leave

Any of you who are due in June already off for maternity leave? I didn't have any problems working all the way through my first two pregnancies, but this one is kicking my butt! I work 11 hour shifts, 4 days a week, and they're thirds so I'm not just pregnant exhausted, I'm work exhausted. I'm lifting patients who weigh more than I do. I'm hurting so much more with this baby than I ever did with my first two and I still have 10 weeks left! I don't think I'm going to make it much longer and it's making me feel guilty. I know my family needs the extra income, and my job is already short staffed. People need me to work, but I honestly cry every day on my way here because I'm so miserable right now. I love my job, but it's just too much! Physically and mentally. I don't know how much longer I can do this