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Yes, a womans cycle is calculated from the first day of her period
When you menstruate is determined by your menstrual cycle, a hormonal domino affect between your brain and reproductive organs. The idea that womens menstrual cycle synchronize is a myth, one womans menstrual cycle cannot change another womans menstrual cycles.
it can last up to a whole week
Menopause
A young lady's menstrual cycle is called a period.
hon it can change every cycle
The first day of a womans menstrual cycle is also the first day of menstruation.
Roughly once a month, hence why it is called a 'monthly period/cycle'
Charlette Ruse
There is no such device. Not even the quacks will not promote such a device. It will not have the placebo effect also.
her mind her mind
No, the rock cycle does not have to start from the sedimentary rock