What are ovulation and implantation? Ovulation is when an egg in a woman\’s ovary matures and is released in preparation for pregnancy. It usually occurs around day 14 of the menstrual cycle. Implantation means that the fertilized egg moves to the endometrium and becomes embedded in it, starting to form the placenta and carrying out pregnancy. What are the key points in time? The critical time point in the conception process is when the fertilized egg combines with the endometrium to reach the appropriate level.