welcome to Health care magic. 1.Yes, you have to worry about the symptoms. 2.It can be again the fluid leakage. With a previous history we should suspect. 3.Get an ultrasound as soon as possible and evaluate the AFI, and fetal well being. 4.Suggest to get an appointment / or ER a soon as possible and get the needful things done. 5.Low lying placenta is another risk factor which needs followup. Get immediate medical help. Hope it helps you. Wish you a good health. Anything to ask ? do not hesitate. Thank you.