i' ve read girls your age usually go on birth control in order to better manager their periods as the birth control has progesterone.
the excercise you were doing most likely lowered your estrogen level and extremem excercise can even halt menstruation.
also certain foods can increases progesterone like yams and sweet pototatoes you may look into that.
the one issue to look out for is excess sugar consumptions because it lowers SHBG and you need this to bound to your E and T without you get out of control estrogen. also high glucose over time can create insuline resistance and also lead to high Testosterone output from the ovaries and lead to PCOS.
A lot of this is literally the exact opposite of what Peat says. I think personal opinions that conflict with Peat's ideas should at least have a disclaimer so that people aren't confused as to what Peat's arguments are.