I used to use the size B mooncup and I've just switched to size A. Had my daughter 6.5 weeks ago and have just got my period (annoying, having not had one since 2010!) so using it for the first time today. I've taken off the whole stem and never had any problems with my last one, but I'm really aware of this one. It feels like it's rubbing, even though there's no stem, and is quite uncomfortable. Have tried removing it and reinserting, am sure it's in properly and in the right place etc. Having used one for years I wasn't forseeing this!
Any ideas as to what it might be? I am wondering if it's not the cup so much as me-maybe I just shouldn't be using it and should stick to pads? I had thought tampons/cups etc were ok by this point though. I don't otherwise have any problems in that area that I know of (anymore!).