Since you have a history of previous cesarean and you have completed term (37 weeks), you should not ignore any kind of pain you perceive.
Regular Pain of gradually increasing intensity in the abdomen associated with backache
and hardening of the abdomen, mucoid discharge from the vagina are indications that you are starting your labor.
The outcome of labor whether a cesarean or a normal delivery depends on the progress of your labor in terms of dilatation of cervix
and contractions (pain) with descent of the baby.
If everything goes normal, you can deliver vaginally even after a previous cesarean birth.
You should visit your gynecologist for an internal examination to check if you are in labor.
Also taking pains at home in previous cesarean is not good as at times the previous cesarean scar on uterus
disrupts with pain. So monitoring by a doctor is a must.
Wishing you all the best.