Thanks for the query to H.C.M. Forum.
Irregular bleeding , scanty menstruation
, age 41 years ( previously regular periods).
May be due to ,
1 Perimenopausal syndrome , which develops 4-8 years before menopause
2 May be due to ovarian cysts
3 Fibroid in uterus.
So consult a Gynaecologist and get his opinion.
Get in blood for Estrogen ( estradiol
) , F S H / L H . ultrasound
will play an important role in diagnosis.