I use the mooncup and I love it!!
I'm now pregnant with my first...
My question is-- do I have to get a different sized mooncup after childbirth? Or is it possible to just use what I have (after post partum bleeding and all).
As for size, I can't comment. I've only had the larger size since I was in the over 30 age group anyway.
ETA: Sorry, just realise I read your post incorrectly. Yep, wouldn't use it for post-partum bleeding as you intend anyhow.
I personally used the same size cup after I had my first baby as before. But frankly, before I had the baby I always felt like the cup was too big.