Definitly make sure your drinking enough. Ive had a lot of fatigue, and got super nauseaus and just pure yucky geelinh a few times this past week (38 weeks). Its just those pesky hormones again! Bring it up to your doctor for sure though, so they can make sure its nothing serious!
Chances aree its morning sickness :( alot of woman experience it again in the third trimester. I have been getting it off and on since about 32 weeks but make sure u.drink plenty of fluids and rest when u can.
Are you drinking plenty of water?