what is in my vagina?

I have never noticed this before but if I stand over a mirror and look inside my vagina I see a small (just bigger than a pea) ball shaped "thing" about a fingertip away from the entrance. I had a hysterectomy a month ago so I am not allowed to put my finger in and feel around inside there. I started bleeding about 3 days ago and cramping but otherwise I have no pain. Can anyone explain what I am seeing? I'm super embarrassed to ask anyone I know coz I might look really stupid 🙇