I don't know why but for me I became very angry out of nowhere and no one had done anything also I became super hungry and thirsty
Typical symptoms are nausea /vomiting, diarrhea, either fatigue or energy, cramping, loss of mucus plug, low appetite, contractions, pressure, discharge. You can have all symptoms and still not go into labor right away.
All I had was increased discharge but then I was in early labor for 19 hours