What are the symptoms of premature delivery? How long they happen. I am asking because if it happens I can be alert and can go to doctor because I am having short cervix. At 21 weeks 2.4 cm. Now I am 25 weeks. I asked doctor for scan she said it's not needed now and everything is normal. But I am tensed about it. Can premature delivery be stopped? She told me to have Duvidilan (R) 40 mg -morning and night for 2 months. Is it ok to have it? What vl be it's benefits and side effects. Will it have any bad effects on baby or it's just to stop premature delivery?