How long until birth if the cervix has softened?

Patient's question:

No

Doctor's answer:

Two weeks before labor, the fetal head can engage. The lower abdomen may repeatedly soften and harden, with a sensation of muscle hardening and swelling. At least one contraction occurs every 10 minutes, lasting 30 seconds or more, or accompanied by cervical canal shortening. This is generally a sign of preterm labor and should be checked by a hospital as soon as possible.