At four months, you are safely in your second trimester. For a mild cough, it is best to start with drug-free remedies like staying well-hydrated, using a cool-mist humidifier, and having a spoonful of honey to soothe your throat. If you need over-the-counter medication, generic dextromethorphan (to suppress a dry cough) and guaifenesin (to help clear mucus) are generally considered safe to use during this stage of pregnancy. Please avoid multi-symptom formulas, alcohol-containing syrups, or decongestants. Always consult your OB/GYN or midwife before starting any new medication to ensure it is safe for your specific pregnancy.