extreme exhaustion!

Cassie
Hey ladies :) first successful (so far) pregnancy at about 6 weeks. I find myself being extremely exhausted, no matter how much sleep or rest I get, I can't combat this! I'm only 22 and feel 90! 
My mom said this was the first thing she noticed in her pregnancies as well.  I take prenatals and eat as well as I can (working 6 days a week at a take out place... lol) 
Do any ladies experience this? What's the best way to combat the pregnancy exhaustion?! I'm desperate!