Periods can change through the years. If you gain/lose weight, have/reduce stress, engage in more/less sex, different meds, etc. It's a dynamic condition, like the rest of your body. I would go to the doctor's in a couple months, discuss the change and see if s/he sees or can think of anything that might have caused it.
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"Never give a sword to a man who can't dance." ~Confucius
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