Exhausted!!

Amber • Joyful mother of Chandler Beckett, born April 17, 2016! 💙👶🏼🍼
I'm 38 weeks today and for the past few days I've gotten increasingly exhausted. My brain feels like it's just a floating cloud and walking around ends up giving me a lot of pressure and pain at the bottom of my belly. Is this normal? I have been trying to read lately, but I can barely keep my eyes open to read one page! 
I am anemic and I've been taking iron supplements every day as well as drinking 4 1liter bottles of water throughout the day.