Hi, usually 14th day of period is the ovulation time, although the exact timing might vary among women or even from month to month. Looking for your monthly patterns can help.during this week have sex regularly it can help you.and follow healthy diet and habits.avoid stress, Take vitamins,and start taking folic acid tablets, it will help to prevent neural tube defects in fetus.and also go for your husband health check up.if any medical problem is there inform your doctor. Infertility means inabillity to conceive after one year of regular sex. Consult obstetrician for furthur evaluation and treatment.