The delay of menstruation by one month, then its occurrence twice in the following month; what is the ruling on the second period?

Question:
You love Allah. She says in her question: A girl did not get her monthly period in one of the months, and in the following month it came to her twice. The first time it lasted with her as usual for six days, and the second time it lasted with her for eight days. She performed the full ritual bath on the sixth day and prayed during the last two days. She says: I am now afraid because the second one might be irregular non-menstrual bleeding, and I did not pray during that period because I thought it was menstruation. If it is irregular non-menstrual bleeding, what is required of me? Because I left off the prayer, and I acknowledge the negligence in that I did not try to ask one of our distinguished scholars. But what reassured me is that I read that the minimum period of purity between two periods is thirteen days and nights. I ask for your guidance. May Allah reward you with good.

Answer:
If the situation is as stated in the question, then the second period is considered part of the menstruation. If the blood came to her as it used to come during her usual time, and there was a time and a gap of days between the two periods, then the second blood is considered menstruation, because the custom may advance or delay, and increase or decrease. So if it comes to her, she sits (does not pray). But if what came to her in the second period was merely a yellowish discharge or a murky discharge, and it was not in the place or time of the custom, then she does not pay attention to it, based on the statement of Umm Atiyyah: "We used not to count the murky discharge or the yellowish discharge after purity as anything." Yes.