A woman must have the conditions for pregnancy, such as normal ovulation, endometrial development of the uterus with the thickness for the fertilized egg to settle, clear fallopian tubes, and good quality male sperm. Abnormalities in any of these will affect the pregnancy process.
After ovulation, the male ejaculate in the vagina, only one of the most vigorous sperm through the cervical opening into the uterine cavity wandering to the fallopian tube waiting for the combination with the egg, through the umbrella end of the fallopian tube pick up the egg function, the egg and sperm in the fallopian tube in the potbelly of the combination of the formation of the fertilized egg. With the swinging of the fallopian tube cilia, the fertilized egg swims back to the uterine cavity, where it will be deposited and develop.
Usually, eight days after fertilization is complete, the fertilized egg begins to settle and develop in the uterus. As the fertilized egg develops, the intrauterine gestational sac can be detected by ultrasound around 40 days after menopause.
Pre-conception checkups are recommended under the guidance of a medical professional if there is a need for fertility in the clinic.