Exhaustion! !

I have read everywhere that exhaustion is normal in the 1st trimester! I'm 9 weeks pregnant and my exhaustion is taking over my life!! I make it to noon then I need a nap I work in a grain elevator away from home so I cant nap anywhere. So when I get home from work I go straight to bed and sleep all night. I understand that you can over sleep but I feel great in the mornings. I'm worried this could be more then just pregnancy. But I'm nervous to go to the Dr for him to tell me it's normal. I don't no how much longer I can handle this for! So my question is do any of you have any advice for exhaustion.