If the blood stops and you see the white thread like discharge, you are pure and must pray! The discharge you see days afterwards has no effect on your purity. Simply purify yourself from it and make wudhu and pray.

Sheikh, my monthly period never last longer than 6th or 7th days, but this month, on the 6th day i saw yellow clear discharge,i made Ghusul & prayed, after that i saw a drop of blood, and again on 7th day i saw again yellow discharge and i made Ghusul & prayed and the 8th day again a blood discharge, but this time i wash only my private area, make Wudu’u and pray… Am I wrong?