A little on my history, I am a 29 year old female. I have a son going on 5 in November. I have had about 4 miscarriages before he was conceived. My question is, in the past I knew when I was miscarrying. But it has been some time since Ive had any misccariages since then. Once my son was born within two months I had Mirena as my chosen birth control. Back to my question, I started my period yesterday, and I just went to washroom and noticed a large flat piece of tissue. Flesh colored with no blood. I am very concerned I am having a miscarriage despite my birth control. I haven't seen anything like that and it was very thick. What do you think?