I have a MeLuna soft...medium or large, can't remember.  I've been using this cup for maybe 8-10 cycles all together, all but 2 of which were over a year ago before I got pregnant with my youngest who is now 6 months old.  This is my second postpartum cycle.  I used the cup again for my first cycle without incident, just the same as I have before, but this time it is leaking all over.  I've put it in half a dozen times exactly like I always have before, and I don't understand what I am doing wrong.  There is nothing wrong with the cup itself.  Twice it didn't catch anything at all (once it may not have been fully open but I believe it was the second time) and was so far up that I could barely reach it to take it out even bearing down as hard as I could (this is definitely not normal).  Other times it seems to be in a more normal position, but catches little to nothing.  Once it was about 1/3 full but had leaked a lot too.  It seems to be in right, definitely has suction, but it's not catching what it should.  What could I be doing wrong?

Also, I don't know if this is related at all, but normally for the first and second day of my cycle the cup stays in the right position but after that it sits lower than is really comfortable and nothing I do will keep it up higher.  Doesn't seem like it would be a pelvic floor strength issue since it always stays up higher the first couple of days.