thanks for your query.
Yes, your menstrual bleeding pattern is definitely not normal.
Passing big blood clots could indicate a bleeding disorder
It could be caused by endometrial hyperplasia
, fibroids in the uterus or adenomyosis
, which is thickening of the wall of the uterus.
Ovarian cysts can rarely cause it.Hypothyroidism
and other hormonal imbalance might cause it.
Please consult a gynecologist for thorough evaluation.