I have a cough at night, i was at doctor and i am taking some medicine , but while it will work can cough harm baby? pregnant 27 weeks

Possibly reflux: If you are coughing only at night it is possible that you're having reflux. Reflux is very common when you're pregnant with stomach juice coming up from below and into your throat causing the cough. The cough by itself wont hurt your baby but if you're not getting a good night sleep that's a problem. Try sleeping in a semi-sitting position and not eating or drinking anything for three hours before you go to bed.