A weird looking thing came out of me today, I thought it could have been an early miscarriage but I am not sure. I start using birth control about 2-3 months ago, and I've been having sex with my boyfriend and we have been using condoms here and there. I missed my period last month and I thought it was due to me starting taking birth control, I took two pregnancy test 2-3 weeks after just to make sure I wasn't pregnant,  and both of them came out negative. A month after or so I started my period, very very light the first 4 days, then I noticed that it started to come out like a  slimy brownish color, the day after this plastic, brown looking thing about 7cm was stuck on my tampon, out of curiosity I took it and felt it and stretched it, it felt like skin. Does someone have any idea what this could be? If yes, please help!! It will be greatly appreciated.