My periods are quite heavy anyway on the second and maybe third day, but by the fourth it's light and usually stops by the evening of the fourth day. I do have a copper iud but I wouldn't say it's increased my flow massively. I'm also under 30 and haven't had any children.
Are there any suggestions of cups that would suit me better? I've looked at the meluna large but don't want to spend the money if it's just going to be the same as the mooncup.