implantation of fertilized ovum in uterus. implanted human embryo in the womb. prenatal development

implantation fertilized ovum uterus implanted human embryo concept pregnancy fetus female body obstetric gynecology illustration diagram placentation gynaecology womb pregnant conception follicle structure fetal stages zygote cell reproduction medicine fertilization anatomy biology egg medical health reproductive vector sperm embryology embryonic fertile microscopic blastocyst science development baby woman insemination