Hello! I am trying the menstrual cup for the first time (I bought the small IrisCup) and am having lots of trouble inserting it. Specifically, I can't tell if it is my cervix or my pubic bone that is blocking it. If it's my pubic bone, I know I should try to push past it if comfortable; but if it is my cervix, I know the cup should lie below it. But it is super low! Like my first knuckle low. How can I tell the difference between the two? Thanks!