I was all slated to travel to Calcutta on official work for a work. I had to call in at work and cancel the trip on the Doctor's advise. It is generally advisable not to travel in the first trimester. The reason I'm told is travel - whatever be the means - by road or air causes exertion. The chances of a miscarriage are the highest in the first trimester due to which travel is not advised. Moreover, the first trimester also brings with it nausea, mood swings, depression etc which varies from woman to woman and can be best coped with at home.