On march 17 my girlfriend experienced a little wetness from her vagina it does mean that it's her first day of being fertile?

“The first day of being fertile” for a woman who has regular, normal menses is usually 12 to 14 days before the onset of her following menstrual bleeding. Better methods of determining her fertile period are by “charting her daily basal body temperature”, correlating her temperature rise with her symptoms of ovulation (pelvic cramps, changes in cervical mucus viscosity)buying “ovulation kits”, REI