uterine lining shed TMI sorry

The most weird yet intriguing thing happened to me. I have not had cramps my full period. All on a sudden I get cramps from the hours of 5pm-9pm... who's was pure torture. While showering I heard a clumping noise hit the tub. I look down and low and behold a fucking piece of uterine lining that looked like raw chicken skin fell out... Ik ik TMI..! The picture is even worse... Has this happened to anyone else?