If your flow is very heavy or your cervix hangs very low when you’re menstruating you may find that the cup leaks a little. Leaks are more frequent for women whose cervix’ move lower during menstruation or if the cup has been inserted too high in the vagina, next to the cervix, or above it.
Remember to make sure the suction air holes are clear before reinserting your cup each time. Rotating the cup a couple of times will make sure that the cup has unfolded inside you.
To catch any small leaks you might want to wear a reusable pad or period pants in conjunction with the cup, especially when you’re trying it for the first few months and you’re still learning about your flow.