pregnant on period???

Let's say it was towards the end though I heard about the lining shedding as well.

If it's at the start and not end of her period, her the lining is still a shedding. That's why I said it's very unlikely as the egg has nothing to attach to even if she does ovulate.

My friend now has a child from having sex during her period. Sperm can live in your vagina for 72 hours and orgasms send a signal to your body to start ovulation. So I'd say, just as likely as any other time during the month.