My legs swell during ovulation and right before my cycle....bad!! I was checked for blood clots...blood work was done several times..etc etc..nothing. It's cyclic. My ankles and feet swell and it can be uncomfortable and embarrassing during this time. I had my uterus removed 10 years ago. The swelling started happening 6 years ago after my laparoscopic surgery to remove a golf ball size mass of endometriosis. Started taking progesterone 100mg to see if it helps relieve symptoms. Also take DIM plus supplement. Im sorry it's happening to you but I'm glad to hear I'm not alone. Seems we are a mystery!