dry cough in pregnancy without any infections can be because of hyperacidity. during the second trimester of pregnancy, the intestinal movements decrease due to pregnancy hormones. this can cause acidity and indigestion, then creating irritation in the throat which causes dry cough. eat small portions of food more times a day. avoid tea, coffee, soft drinks, smoking, staying awake late at night and eating spicy,fried food. mild antacids can help too.