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When you’re not ready to be pregnant, a late period is one of the scariest things in the world to deal with. You start to assume every slight change in your body is its way of telling you that you’re with child. But don’t buy every brand of pregnancy test in the drug store aisle just yet. There are quite a few reasons your period could be late — even if it usually comes like clockwork.

Check out these foods, lifestyle changes and even vacations that can actually disrupt your schedule. However, if your period continues to arrive off schedule for some time, you should probably see your doctor. Any period changes that last more than a month or so should be checked out.

Corbis

Corbis

Stress

If a situation is real enough to occupy your mind most of the time, it’s real enough to make your period late. And if stress really is the problem, your period might continue to be late until you find ways to relax.

Image Source: Shutterstock

Image Source: Shutterstock

Medication

Not every doctor will tell you that a new prescription might delay or stop your period as a side effect. But everything from blood pressure medication to antidepressants can affect your cycle. If you notice a change after a new medication, talk to your doctor to see if what you’re taking might be the problem.

Shutterstock

Shutterstock

PCOS

Some changes in your period can suggest a deeper problem. PCOS, also known as polycystic ovary syndrome, affects 10 percent of women and can make your periods painful and irregular. If you also notice acne, extra hair growth and weight gain that you can’t explain, you should bring this up with your doctor.

Corbis

Corbis

Feeling Like Something Is “Off”

If something has been bothering you for a while and you haven’t gotten it checked out, it could also be affecting your period. When diseases and illnesses are left untreated, they can throw your period off schedule or even make it skip months.