Gestation period, oocytes, vaginal pH, menstrual cycle: normal numbers 4 is the normal pH of the vagina. 40 weeks is the normal gestation period. 400 oocytes released between menarche and menopause. 400,000 oocytes present at puberty. 28 days in a normal menstrual cycle. 280 days (from last normal menstrual period) in a normal gestation period.