I have tried the Diva cup and the the Mooncup UK (both in the over 30 and had a baby size) for the past nine cycles (the first nine cycles I've had post partum). I've always had lots of leaking regardless of the position I insert. I feel that I'm pretty experienced enough that I know when I have a good seal and when it has popped open properly, so I don't think thats the problem. I spoke with my midwife today and she told me she remembers that I have a tilted uterus. So, I went and checked my cervix, I'm day 4 of my cycle, my cervix was two knuckles in on my middle finger! Pretty low! And it was pointed toward my belly button when I was checking (while on the toilet), so its definitely tilted. So between the tilt and low position of my cervix now wonder I've been having problems! I was wondering if anyone could recommend certain cups and/or sizes to try! I would greatly appreciate it!!