Feeling off? 36wks 4 days

Woke up at 8am(went to bed around 1am because couldn’t get comfortable and I was nauseated) been awake since I can’t really sleep anymore because I can’t get comfortable but I feel like I have the flu but I don’t have a fever. Could it be from me working on feet for 8 hours with no break and just over doing it? Or just my body preparing for labor?

Is anyone else feeling like this?