Never ever attempt to self mediate while being pregnant especially in the 1st trimester. Don't buy over the counter meds too w/o any prescription. Very risky for your pregnancy. You have no idea if it's suitable for pregnant woman or not. Better see a dr.
Cold and cough is very common in the 1st trimester as your body is going through a lot of hormonal changes. Cover yourself. Drink hot drinks. Shower with warm water (not hot). This phase will subside when you reach the 2nd trimester.
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