the three symptoms are:
1. "red"
2. "broken water"
3. 陣痛
for public hospital, their advice is go to the hospital immediately if 1) OR 2); OR 3) once ~10-15 mins
for private hospital, my doc's advice is to go to the hospital immediately if 2) OR 3) once ~10-15 mins (OR 1 call her immediately to describe the situation)