Only after the egg has implanted, it triggers hormonal changes in your body, which lead to the loss of period. After that the first symptoms of pregnancy appear. So, implantation is always the cause of the menstruation absence. And missed period is just a consequence in such case.
A Pagan Resource Site. There is a fifth element that most of us the in the Craft recognize. This is the element of Spirit, known as Ether or Akasha. This is the element that transcends, yet is a part of, all the other elements.
The Spirit is the highest expression of universal individuality -- an oxymoron which contains, within, many keys to truth -- and has its roots with God and with all the spirits, within the highest realm of Creation; a realm which we cannot even begin to comprehend, here on the Earth plane.