Please help me interpret this verse 65:4 Al Talaq, mentions the 3 months waiting period for those in menopause, those who haven’t gotten their period and those who are pregnant. I was a little surprised to see what “those who have no menstruated” was on the list. Does this mean pubescent girls? If thats what it means, then pubescent girls have to wait the three month (Iddah) to make sure theyre not pregnant with their ex husbands baby?

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“Those who have not menstruated” means any woman who is yet to have a period.
Who says that the waiting period is to determine that she isn’t pregnant? If that is the case, then why are there many different types of waiting periods. Just to add the pregnancy part is part of the ruling, but not the reason for the ruling.