Freebeeeeeeeeeeeeeeeeeees... In speaking with many here, the reduction of stessors often comes up. Check your Thyroid TSH levels!  Mui importante! The Science of Breath - life changing, affirming and regulating! https://www.yogajournal.com/yoga-101/science-breathing/ https://www.unm.edu/~lkravitz/Article%20folder/Breathing.html#:~:text=Respiration%20Mechanics%20102,to%20the%20lungs)%20respiration%20occurs. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6137615/   Girls and guys - want to know when a woman bleeds every month?  Know her birth day.  This is a golden nugget of knowledge society keeps us from knowing in order to keep us enslaved, fearful and reactionary.  There are variables, of course.  Stress....hormonal imbalances....medications....being in close proximity to other women, either in family or work.  If the other women are more dominant, they will set another womans cycle off or if their birth day is near to yours, then they can trigger yours.  You're welcome.