Welcome to HealthCareMagic,
In a regular menstrual cycle of 28 days, ovulation generally occurs on 14th day of menstrual period. You haven't mentioned the average duration of your menstrual cycle & whether cycle is regular or not, thus it is not possible to calculate fertile period. Siphene
tablet is given to you, to stimulate ovulation. You should use ovulation prediction
kit to identify date of ovulation and have physical relation on the day of ovulation and for few days thereafter.
Hope you found my response to your query informative and helpful.
With good wishes,
Dr.Chandra Shekhar Sharma