Hi. I began my period last night with heavy cramping and light bleeding. This morning, before I getting into the shower, I noticed a large clot on my pad. I thought little of it and showered. During my shower, however, another clot passed and was about four cm in length, and was bloody but also white/grey and stringy. It was strong, almost like chicken skin or muscle tissue. There is no chance of pregnancy as I have not been sexually active for about six months. Did I happen to pass part of my uterine lining this morning?