11 weeks and beyond EXHAUSTED

This is my second pregnancy, my first one was a complete breeze! This one, I’ve had weird cravings, nasea, throwing up the works. I just hit 11 weeks pregnant today and all of a sudden I’m sooo EXHAUSTED. Like falling asleep during the day with my 1yr old still awake. Having trouble keeping my eyes open. How can I help I‎t? Or can I? I’ve never experienced tiredness like this before and I’m a nurse who works 12hr shifts and has kids to take care of when I get home. TIA!