Is it permissible to pray and fast while a light green, odorous discharge comes from the vagina for 10 to 15 days, a week before menstruation?

You must not abandon prayer and fasting upon seeing these discharges, for they are not considered menstruation unless they are a brownish discharge during the customary period or are continuous with blood. So, if you see the well-known menstrual blood, or a yellowish or brownish discharge during your customary period, then this is menstruation. As for these discharges, you must purify yourself from them, perform ablution, and pray. If they last throughout the entire prayer time, then perform ablution after the time for prayer begins and pray.