What could cause this?

normally i get my period like clockwork and it lasts 4 days, but this month i was late and it has lasted 7 days. what could cause the sudden change? i've had them regularly for 7 years.

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Answer:
It could be a few things, Changes in your diet, in your weight, stress, medication. The body is rather fragile so even the slightest changes can set it back. However i really wouldnt worry about it to much as you did get your period, which would have been cause for concern. Each woman at one point in time experiences a slight change in her cycle, they are unpredictable and change a lot. If you didnt have any symptoms, be it pain, or anything that’s uncommon for you when it comes to period symptoms then i think you can just chalk it up to your body adjusting to change.

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Answer:
Many things can effect your cycle, and your cycle can also change at any time. Stress, changes in weight etc can all have an effect. I wouldn't worry about it too much

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Answer:
Hormone changes, diet, stress, exercise, change in weight, medications etc.