Does Passing Blood Clot During Menstruation Indicate Miscarriage?

hello my name is Monica. i am 38 yrs old and i think i may have had a miscarriage last night. how ever i am not sure at this point in my life i don t want to have anymore children. but last night i passed a blood clot that was unusual, normally i pass just gelatinous masses, but this time it was large and stringy in texture also had a two tone coloration.