What did you tell your son about menstrual cycles and when? I'm having the first period I've had in years (Iud, then pregnancy, then bf) and I'm scared of my son seeing it. I was in the shower and I had used the restroom but didn't flush because I didn't want the water to run cold and he almost came in to use the potty (like a hundred times before). I told him to go to the other one before he saw anything but I'm still scared he will see it somehow in the trash or something. So, what did you tell your son about it and when?