Some say that during this critical period, travelling by public transport like autorickshaws or two wheelers must be avoided, especially over bumpy roads. However, there isn’t any evidence that this can cause great harm to the foetus.
Nevertheless, if you can manage to find an alternative way to travel then do so. Sometimes a bumpy ride can cause spotting or bleeding in the case of a complicated pregnancy. You may wish to talk to your doctor about this in more depth to put your mind at ease.