For pregnancy, fertilization must occur of a female egg by male partner’s sperm. A number of follicles are present in the ovaries right from birth. After a female attains puberty, these follicles mature to produce eggs, one egg a month. These eggs are released during mid cycle (called Ovulation) and are picked by ampullary end of Fallopian tubes.
These are the pair of tubes, one each side of uterus, which help in transport of eggs to uterus. If sperms are deposited around vagina at the time of ovulation, they swim up to reach the tubes, and under favorable circumstances, fertilization occurs in the tubes itself. Post fertilization, zygote is formed which reaches uterus for implantation and further development of embryo.
Infertility is the inability of a couple to get pregnant due to causative factors related to female or male.