When I have my period , which I am currently on, whenever I have to defecate, it causes me intense and sharp pains down below. It is a severe burst of pain that lasts no more than 5 seconds and is only relieved when I stand up from the toliet. But this causes me to not want to use the restroom on my period because it causes me pain to even sit try. I'm not constipated , I can go -- it's just that i don't want to due to the severe pain. I'm also 15 turning 16 if that helps anything. I've been experiencing this for maybe the past year / year and a half now. Is there anything I can or should do/ know?