What Causes Burning Sensation In Uterus?

I have been getting a burning feeling in my, I want to say ovaries and uterus. it happened about a week before my menstrual cycle, which was late by 3 day. I also have had to frfrequently urinate, which isn t uncommon, I have an overactive bladder but it s been more than normal. I have had a utI before and this feels nothing like latest time.