But what happens if the blood only continues the first 24h then it becomes clean/ flow stops and then continues after 24hours until the whole period is done? My period is scheduled so I know exactly when it comes but sometimes it doesn’t begins with continuous flow the first 3 days (huqm for haythd). Do I have to repray what I missed the first day?

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If at the start, it doesn’t have a continuous flow, that will be istihadha and you will have to follow the rules of istihadha. Once the blood flow gains continuity with the the conditions mentioned earlier, that will be when you will start following the rules of Haydh.