I missed my period, I'm exactly one week late, 3 days ago I took a pregnancy test said no, later that day I looked at it and there were two lines, meaning it said yes, the next day I took one and it said no. today I thought I had started my period. A piece of tissue kind of looked like meat came out and now I'm barley bleeding, and not very much pain, what could this be? A miscarriage?

