The reasons for not getting pregnant despite having intercourse during the ovulation period primarily involve considering whether there is an issue with the male partner’s sperm. Additionally, although it is the ovulation period, the development of the follicles must also be examined. If the follicles are undeveloped, or if they are very small, pregnancy is unlikely in such cases. Moreover, the condition of the fallopian tubes should be checked, as both the egg and the sperm need to travel through these tubes. If the fallopian tubes are blocked, it will prevent pregnancy because the sperm and egg cannot meet, leading to infertility.