Does the questioner consider what she experienced of yellowish discharge, brownish discharge, and light, intermittent bleeding to be menstruation, especially since there were mild symptoms, and if her period then comes with its usual characteristics, would that be considered استِحاضَة (istihāḍah - prolonged non-menstrual bleeding)?

The minimum duration of menstruation, according to the majority of scholars, is one day and one night, and its maximum is fifteen days. Yellowish and brownish discharges are considered menstruation if they are connected to the blood at its end. If the bleeding is less than one day and one night, or exceeds fifteen days, then the woman is considered to be suffering from Istihadah (prolonged non-menstrual vaginal bleeding).