Welcome to HCM,
As you had miscarriage
on 5th march, bleeding on 6th march can not be due to menstrual period, but bleeding on 23rd march can be due to menstrual period. If bleeding on 23rd march was due to menstrual period, then outcome of intercourse on 20th march can not be a pregnancy
. You might be suffering with irregular Uterine bleeding
. Brownish discharge can be due to infection. Please consult a Gynecologist for proper evaluation & treatment.
Wish you good health,