I am trying for pregnancy for 4 months and consulted doctor and taking medicines as instructed. Shall I do long travel in this time?

Certainly . Traveling while attempting to get pregnant is not only safe, but it may help you to conceive! That's because if you are going on a nice vacation away from the stresses of everyday life, it may help you relax and not focus so much on getting pregnant but focus on fun and your personal relationship. Enjoy your travel and be safe!