Could Delayed Periods Be Due To Change Of Place?

i have been studying in bangalore for one year and i am nt very active for 1 year and i got my periods on 26 march and i came back to my country and today is 7 still a didn't get my periods .. i am very active in my country and also these days i am really in stress cause of these period thing can this be because of the change in my food and every thing ??