Dr. Hanif warmly welcomes you! Thanks for consulting at my virtual clinic HCM. I have carefully worked through your case, and can well realize your health worries. Being your physician, I want to assure, I will take care all of your medical concerns. Changed sensation of smell is very common an issue in pregnancy and there is no link of real presence of some gas around you. This is just a subjective feeling and there is no harm even to you and absolutely no harm to your baby. There is no gas actually, but you perceive it. Most commonly it happens in pregnancy due to dryness of the nasal mucosa and is a reversible issue. No long lasting harm is seen. You need to do nasal douches with Luke warm water with little salt in it, 3-4times a day. Spray Saline nasal spray. You will get better in no time. Take plenty of water, and fruits, salads and vegetables. Avoid coffee, tea, beverages, chocolates, energy drinks. Hope I answered all of your questions. Please click on I Find This Answer Helpful and don t forget to add your precious positive feedback to help me able to assist you better in future too. Have a wonderful time ahead. Keep in touch for a follow-up too to let me know if you have any doubts & need further assistance. I am available 24/7 for providing you my expert medical opinion on any issue. Have a blessed time ahead. Regards! DR. MUHAMMAD HANIF USA