How should a married woman with three children, who uses a contraceptive implant, act when she experiences intermittent discharge after her menstrual period, especially concerning prayer and ritual bathing (ghusl)? Should this discharge be treated as istihaadah (prolonged non-menstrual vaginal bleeding)?

If the discharge is yellow or brownish after seeing the cleanliness, it is not considered menses, and one must perform istinja' (washing the private parts) and wudu' (ablution) for prayer. However, if it is blood during a period that could be menses (provided that its duration, along with the previous blood and any intervening clean periods, does not exceed fifteen days), then it is considered menses. If it exceeds this duration, it is considered istihadha (non-menstrual vaginal bleeding), and the rulings for a woman with istihadha apply.