My last menstruation is September 6 what day I'm I fertile? Or what day should I conceive? Thank

Not sure about the day, but you can also identify your fertility when your discharge is clear, like (uncooked) egg white clear. That kind of discharge helps the sperm to move up. We had sex the day after I saw that discharge and now I'm 3 months pregnant. And also don't forget to pray if you're religious 😊