actually, no every body is the same in terms of the workings of the follicular and luteal phases- as well as conception and implantation timeline. The follicular phase can be influenced by outside factors (stress, illness, medications, etc) that can lead to a delayed ovulation or even annovulation (no ovulation). The luteal phase is the constant part of the reproductive cycle (12-15 days depending on the individual cycle but most often 14 days) and if it is less than 10 days the woman is considered to have a luteal phase defect and is treated accordingly.
If someone is truly on their period then their lining is being shed- giving a possible embryo nothing to implant to- which is how the "Plan B" or "the morning after pill" operates: by forcing the lining to shed.
So again- no you cannot get pregnant on your period UNLESS you bleed for between 8-10 days (this does not include spotting). Only then will a womans fertile woman actually play a role so close to cessation of bleeding
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