This is going to sound perhaps a bit obvious but hear me out. Your period, the bleeding bit, is just one part of your cycle. It might feel like the main event and for many of us it’s painful, tiring and totally overwhelming. But so many other details are hugely important – like the length of your cycle, the way you feel physically throughout it, the emotional changes, when you ovulate, your energy levels. It’s all important information that we should know about our bodies. Changes or irregularities can be indicators of gynaecological problems, stress levels, infections, bone health, the beginning of the menopause.
Article source: https://www.huffingtonpost.co.uk/entry/fascinating-facts-you-probably-didnt-know-about-your-period-and-cycle_uk_6246ca4ce4b068157f75dc63