Can’t get my cup in far enough

I’m trying to use my cup for the first time since I had my daughter and I can’t get it in far enough. As soon as it’s in most of the way it opens up and won’t budge but the stem is still out just a little bit so it’s uncomfortable. I can’t turn it either. Is it possible I need a smaller cup after giving birth? I had a c-section so I didn’t think it would affect anything.