++ [ originally posted by Dominic ] ++
When they join an embryo is created, an embryo is not a living organism.
Weeks One through Four
* Ovulation occurs - The time is right; now you just need this egg to be fertilized!
* Conception occurs - Did you know that during your pregnancy that your uterus will increase its capacity by 1000 times?!
* Gender is determined - Immediately upon fertilization your little one is set as a boy or a girl. Ladies, this is one that you can't take credit for since it is up to the sperm to determine the sex of your baby. Sperm carries either a "X" (girl) chromosome or a "Y" (boy) chromosome. (*Hint:* You will have to hold off on picking out the pink or blue until at least the second trimester when the gender will be visible via ultrasound.)
* Implantation - Some spotting (also known as implantation bleeding) may occur about 10 - 14 days after conception. You may believe you are starting your period but generally this bleeding is extremely light and lasts only a day or so.
* Neural tube forms - It will develop into the nervous system (Brain, spinal cord, hair, and skin). Already your baby has the foundation for thought, senses, feeling, and more!
* Heart and primitive circulatory system rapidly form - While still in its beginning stages, this is the very life support system that will carry your child throughout his or her life.
Week Five
* First heartbeats begin - If you have an early ultrasound you may not be able to recognize this tiny being as a baby, but there is no mistaking what it feels like seeing your child's heartbeat on that screen. That rhythmic beat is echoed in your own heart.
* Umbilical cord develops - This is your baby's lifeline in utero. It bears the responsibility of pumping in oxygen, removing waste, and supplying the necessary nutrients for the remainder of your pregnancy.
* Blood is now pumping - All four heart chambers are now functioning, insuring your baby's body will receive all it needs over not only the remainder of your pregnancy but throughout life.
* Most other organs begin to develop - Your infant's lungs start to appear, along with her brain. Already your little one is preparing for a quest for lifelong learning!
* Arm and leg buds appear - While they may not appear to be much at this stage it is ok to dream of the future. Just imagine your ballerina twirling and jumping around your kitchen floor. Or perhaps you will have the precocious boy that throws the perfect pitch -- right through the neighbor's window.
Unless you get the morning after pill, by the time you find out youre pregnant there will be heartbeat already. If the heart is beating isnt it life?