HELP PLEASE!

Caris

A friend of mine started her period on the 24th of September and ended on the 28th of September.

Her cycle is 28 days with five days of menstration.

She then had sex on the 18th of October and the guy ejaculated in her.

I want to ask if per the day of sexual intercourse, she was in the safe zone

What are her chances of getting pregnant or not getting pregnant?

Is she safe?