Seems to me that it could be something gastrointestinal instead of endo. Possibly muscle strain? Drinking enough water? And your not eating before workouts right?
It could be endo but it could also be POS(Polycystic Ovarian Syndrome) as I've been diagnosed with that and I'm feeling pain in my pelvic area,it's swollen in that area and I'm having irregular periods,if your periods are also irregular it could be either.I suggest you do a pelvic ultrasound so they can find out what's the underlying cause.
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