Is the blood that appeared after intercourse considered menstrual blood, and do I have to make up the Dhuhr and Asr prayers from the eighth day, given that purity was achieved on that day?

The ritual bath (ghusl) was obligatory immediately upon seeing purity at the beginning of the eighth day. The prayers missed between seeing purity and performing the ghusl must be made up. The returning blood is considered menstrual blood (hayd) because it occurred within a period suitable for menstruation. After performing the ghusl and praying following the cessation of blood, there is no sin for the intercourse that occurred during the state of purity.