37.4 weeks

I am a first time mom and my OB said I can easily go into labor since I discontinued my medicine to stop contractions!! I can tolerate pain but I can’t tell if I’m having regular contractions because I can tolerate pain! But I am having some abdominal pain and low back pain! I have been drinking water and it doesn’t seem to be easing up! I have a OB appt in the morning to do a NST!! But I don’t know if I am having contractions to go to ER!