Thanks for the query.
Before periods the vaginal discharge
can increase physiologically.
So try to distinguish physiological discharge from pathological one.
If the smell you mentioned is appearing as foul smell and if there are any associated features like itching, change in color of vaginal discharge etc, there is possibility of infection.
In that case, you consult your gynecologist once, get examined and go for vaginal swab culture and sensitivity.
By this the possible causative organism can be identified and treated.
If bacterial vaginosis
is recurring try to find out the cause for repetitive occurrence and clear that.
Both partners to be treated simultaneously to prevent future cross infections.
Better to avoid taking drugs without consulting the doctor.