I think I may have mistaken a miscarriage as my period...

I've been back on birth control for about 3 months now but I think I had a miscarriage last month and didn't know. I was online researching trying to find when looked similar to what I saw last month. Around the time AF was visiting, I used the restroom at my MIL house and to my surprise I see something in the toilet that looked similar to the photos above without the black dot where the eye was. I looked at it very closely, but I couldn't see if it was a baby or not, but it definitely wasn't a blood clot. It was the same exact color as the first photo but looked more the the second. I haven't said anything to my husband about it yet because I'm not sure it true or if it could've even been possible because I'm on birth control.. I need help.. did I have a miscarriage and not know? I didn't even know I was pregnant..