If your cough if from a cold, it should go away within 7-10 days. If you have a bronchitis, the oral antibiotics should take care of it. But if it persists, then another common reason for chronic cough is throat reflux. For whatever reason, small amounts of stomach juices can leak up (enlarging uterus is one good reason), and it can irritate the throat. Try eating early, at least 3-4 hours before bedtime. Sleep on your left side. If not improved, talk to your doctor about a referral to an ENT for a more thorough evaluation.