first time mom to be

Chrissy
Due Monday. 
What are some oncoming signs of labor. 
Iv been having bad nausea. sick feeling, having a hard time eating like I want to but bad nausea everytime I try. Constantly tired. Just feel really off. 
Wednesday my dr said she gives it a few days to a week before little man will be here I just feel awful. Not to mention super emotional for every little reason
Any help or opinions why I feel this way.