Mentrual Colector

I recently tried to use menstrual colector, and unfortunately for me for some reason wont work at all, as much as i tried to make sure it was properly set inside me the blood kept dripping partially outside of it, not mentioning that at the times i could feel it would just “move”

If i go by the rules im 30 years old and have no kids, so my size should be S, but i had and abortion a long time ago and it makes me wonder if i don’t have the wrong size