At four months of pregnancy, for cold and cough you should use only safe options like steam inhalation, warm fluids, and salt-water gargles help a lot. For medicines, paracetamol is generally safe for fever or body ache, and simple cough syrups without strong drugs may be used, but avoid self-medicating with antibiotics or strong cold medicines. If symptoms are severe, persistent, or you have fever, consult your doctor to get pregnancy-safe treatment.