Two weeks before delivered loose mucus plug then contractions, bleeding and fully dilated at 25 weeks pregnant is these a weak cervix symptoms?

Preterm labor.: The symptoms you describe do not support a diagnosis of incompetent cervix, rather a typical preterm labor and delivery. You should get early prenatal care with all future pregnancies, consume Folic Acid 1-5 mg daily for the rest of your reproductive life and receive intramuscular weekly 17-hydroxy Progesterone caproate after 16 weeks to prevent recurrence.