Menstrual cycle?

Why would ones menstrual cycle suddenly shorten. Mine has be a week shorter than usual for the last couple of months. I am usually comparatively regular and was of late wondering what might cause this. I'm 19 btw.
Answers:

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Many things effect your hormones which in turn effect your menstral cycle. Women's cycles don't become extremely consistant until they are in their mid 20s. First, I would say aloud it's probably just your age. Secondly, excercise, absence of excercise, stress levels, vitamins, sexual buzz, emotions...everything you do or guzzle has an effect on your biochemistry and your hormones. Question your calendar 2nd...when you period changed be it at a time when you started a new workout routine. Did you do something that made you stressed or be stress relieving...etc? Third, The people that are around you can effect your menstral cycle. Have you be around (on a very regular basis) different women whose cycle could hold effected yours?

As long as you are have regular, non painful, appropriate length period then it is probably due to a conveyance in your biochemistry and hormones.

If you experience niggle, changes within your skin, signifigantly lighter or heavier periods, or if your cycle change again then you might want to see a doctor.

However, it is hugely mature of you to hold on to track of your menses at 19. Most women don't pay attention to that until they are trying to return with pregnant, or think they might accidentally be pregnant.

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I don't why it happens, but it happen to me. I'm regular for a looooooong time and then suddenly it shortens for a few months and after goes backbone to normal.

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Could be the McClintock effect - where on earth women who are close sometimes find their periods synchronising.

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If you started your period , let say at 16 , it might dance irregular . Usually if you have newly got it , it it take at least 2-3 years to catch it on a regular basis.
I get my when I was really youthful and it used to be heavy. Now , it last 3 days and sometimes 4. So it just have to get into the path your body works. Your ok.

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this could be caused by a fine-tuning in lifestyle for example more or smaller quantity stress or different day to year activities