Hello
thanks for your query.
It could have been a missed
miscarriage, wherein the pregnancy failed and the tissue got expelled.
It could be that you are suffering from
polycystic ovaries, or
endometrial hyperplasia, wherein the lining of the uterus gets thickened, and then gets shed off, resembling a fleshy tissue.
Please consult a gynecologist for an
ultrasound.
take care.