During sexual intercourse, millions of sperms are transferred from the male body to the female vagina. Sperms swim through the cervix to the female uterus before proceeding towards the ovum in the Fallopian tube. Fertilisation occurs in the Fallopian tube where only one lucky sperm will fuse with the ovum to produce a zygote. The zygote produced divides many times and develops into an embryo on its way rolling to the uterus. Finally, the embryo implants itself to the uterus wall which is rich with blood capillaries.