Wtf ?!

Ok so... a little while ago I noticed when I put tampons in it was slightly uncomfortable( like pressure maybe ? Only when inserting the tampon, after i was done I couldn't feel it anymore) well I was taking my tampon out one day and after I had pulled it out I heard something splash into the toilet. I looked and it was like this little meat looking thing ? Kinda shaped like the uterus is, small maybe about two inches long and an inch wide. Anyone know what the heck that's about it, what it was ? I sent a picture to my friend and she said it kinda looked like the lining of your uterus. I've never had any kids and that just kinda freaked me out. But I guess that explained the pressure I was feeling from inserting tampons. Any opinions ? I wasn't sure if this was normal.