Can a woman who goes to menstruation after 23 days get pregnant 7 days after her period ends?

All women ovulate exactly 2 weeks before their period begins. That is 14 days. A 23 day cycle-14 days back to your ovulation=9. The 9th day of your cycle would have been when you ovulated, and unless you have a 2-4 day period then it wouldn't be most likely to get pregnant 7 days after your period.