When it comes to decongesting your chest during pregnancy, the best thing you can do is to try natural remedies first. This includes drinking plenty of fluids like water, herbal teas and warm lemon drinks that are known for helping break up mucus. You should also use a humidifier in your home or office to help keep the air moist and reduce congestion. Additionally, taking steamy showers or baths several times per day can be helpful in relieving chest congestion as well. Lastly, make sure to get regular exercise which will help loosen up any mucus buildup in your chest and clear out your airways.