I have a short cervix what menstrual cup size should I opt for?
Many women with short cervices (read more here) use the small sized-menstrual cups, but this is case by case.
Some menstrual cup size charts do make suggestions of cup sizes for women with short cervices or a shallow birth canal. Your best bet for finding the right size (besides trial and error) is to find a small cup that features a stem that can be trimmed so that the stem does not poke out of the vagina.