Travel-induced stress, even positive, troubled sleep, and other sudden lifestyle changes, can affect this balance. No one can predict how your body will react to these changes, but you can expect to have both early and late period.
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Traveling across time zones can throw your hormones — and your menstrual cycle — out-of-whack. The further you go, the more likely you are to be affected. This might not matter much if you're visiting Grandma in Norway.
Although some people may notice a change in their menstrual cycle and ovulation during or after a trip, the majority are unaffected. Travel can certainly agitate and manipulate the timing of ovulation, but so can just about anything that causes a lot of stress.