The Conception Process

An egg can only become fertilized under the proper conditions – with healthy sperm and eggs and during the right time leading up to ovulation.

Upon  fertilization, the chromosomes of both the egg and sperm come together. At that point, the sex of the fertilized egg will already have been determined. If it is a boy, that means the sperm that fertilized the egg has a Y chromosome; if it is female, then the sperm has two X chromosome. In fact, the entire genetic code is present in the single-cell organism at this stage. When an egg becomes fertilized, it is then called a “zygote.”

In order to keep the remaining sperm out (generally, about 250 additional sperm will have traveled to the egg’s vicinity), the fertilized egg closes its outermost membrane immediately. Within minutes of conception, the cells begins rapidly dividing and multiplying and then the zygote transforms into a blastocyst. The cells that are being produced will aid in the baby’s development, while others are responsible for making up the umbilical cord, amniotic sac, and placenta.

Implantation occurs when the blastocyst fixes itself to endometrium of the uterus. It can take as few as three or four days, but may also take up to ten days. An exchange of hormones takes place to aid the blastocyst implant. Once it has become implanted the developing, fertilized egg is referred to as “embryo.” Pregnancy is counted from the first day of your last menstrual period (LMP). From that point, most pregnancies last about 40 weeks. 1

Within the very first week of pregnancy, the one-cell zygote transforms into millions of cells. There are three different cell groups that begin taking action at that point. The mesoderm forms muscles, kidneys, reproductive organs, circulatory system, and skeleton; the ectoderm forms the senses, skin, and nervous system; and the endoderm forms the respiratory and gastrointestinal systems. By week two, hormones emanate from the embryo, causing the mother’s menstrual cycle to halt for pregnancy. By the third week, the heartbeat starts. During week four, the brain develops, as well as the eyes, ears, and a mouth opening. The embryo begins pumping its own blood, and arms and legs begin to develop. It is also during this time that the umbilical cord is developed and the placenta begins functioning. The placenta is an organ that supplies developing babies with oxygen and nutrients, and also removes waste as needed. Development continues to take place, and it is usually by week eight that most people begin to refer to the developing life as a “fetus.” It is also during that point that joints form, and the heart beats about 60 times per minute.2   [avafootnote]

Find Your Fertile Window - Order Now

  1. American Pregnancy Association. (2015 July). “5 Weeks Pregnant: The Fifth Week of Pregnancy.” Retrieved October 31, 2015, from
  2. Hartford, D. (2012). “The Early Prenatal Development of a Person.” VSM Resources. Retrieved October 23, 2015, from

Ava for healthcare professionals

Please confirm that you are a healthcare professional or researcher

I am a healthcare professional

I am interested in Ava for personal use

Learn More | ORDER NOW

Jade & Tanner Got Pregnant with Ava!

Thank you everyone for all the support and for sharing your stories since we announced our pregnancy on Wednesday! We are so excited! For those of you who have been following us for a while, you may have seen our past post back in November about using the @avawomen bracelet to help us get pregnant faster. We got pregnant really soon after we started using Ava! I wore the bracelet every night while sleeping and Ava told us which five days were the best days to try for a baby each month. It took so much stress out of the process and was so easy to use. Since so many of you have kindly opened your hearts to me and have shared your stories about trying to get pregnant, I wanted to share what worked for us. Also, I've partnered with Ava to get you all a $20 off coupon code: JANNERBABY I'll be using Ava for all our future pregnancies and cycle tracking between babies. Thank you, Ava.

Mamiblock Got Pregnant with Ava!

@Mamiblock​ benutzt nun auch Ava! Hier ein kleiner Ausschnitt aus Julias Beitrag auf Youtube in dem sie erklärt, wie Ava funktioniert! Wir sind gespannt, wie es weiter geht mit Ava und Julia! Einen erholsamen Samstag Euch allen!

Learn More | ORDER NOW

Learn More | ORDER NOW

Learn More | ORDER NOW

Learn More | ORDER NOW

Learn More | ORDER NOW

Learn More | ORDER NOW

By continuing to use the site, you agree to the use of cookies. more information

This site is using first and third party cookies to be able to adapt the advertising based on your preferences. If you want to know more or modify your settings, click here. By continuing to use the site, you agree to the use of cookies.