Hello, You need to do unprotected sex without any contraceptive pill or method around ovulation time (14 days prior to due date) or fertile days to maximize chance of pregnancy. You can use ovulation prediction kit (LH kit) to predict ovulation time. If you do not able to conceive naturally, then some investigations are required to rule out causes of primary infertility. These include husband semen analysis, pelvic ultrasound scan, complete hormone assay, thyroid profile, serial follicular study, tubal patency test, other serological tests etc. Here, you need to consult with infertility specialist for complete guidance about investigation & treatment procedure. Take vit-E, folic acid supplements with healthy diet, do regular exercise, avoid stress, maintain genital hygiene, take sound sleep. All the best.