It's normal for your cycle to be thrown off course and perhaps even miss a period when you travel. If you have concerns about skipping a period, or you miss two or more cycles once you return, reach out to your healthcare provider for guidance.
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Generally, air travel before 36 weeks of pregnancy is considered safe for people who aren't dealing with any pregnancy problems. Still, if you're pregnant, it's a good idea to talk with your health care provider before you fly.