Thanks for the query.
Symptoms of brown discharge, sore breasts and tiredness
are not definitive symptoms of pregnancy
Since you are not getting periods since many years, less likely you are pregnant .
Please get a urine pregnancy test to rule out pregnancy. And an ultrasound
to be more sure.
You need to consult your gynecologist to look for the causes of absent periods for years(if not menopause
hope this helps.