• ultrasound of human fetus at 23 weeks exactly
    Week 23 of Pregnancy
    You are 23 Weeks Exactly Pregnant
    Your baby todayExternal appearances are deceptive: although your baby seems very well developed, it's still early in the pregnancy-the state of the cervix and progesterone produced by the placenta both play a part in ensuring that labor does not ...
  • Pregnancy
    Week 4 of Pregnancy
    You are 3 Weeks and 3 Days Pregnant
    Your baby todayThe embryo is implanted and is 10 days old. The entry point at which the embryo buried into the lining of the uterus is now covered by a clot, and this prevents blood loss and protects the embryo. ...
  • sperm cell traveling along fallopian tube
    Week 2 of Pregnancy
    Day 13 of your Menstrual Cycle
    What's happening insideThe sperm cell can be seen here inside the fallopian tube. Since sperm can stay active and alive inside you for up to 72 hours, it's possible to get pregnant even if you don't ovulate for two to three days from now. ...
  • 3 Weeks 5 Days Pregnant Blastocyst
    Week 4 of Pregnancy
    You are 3 Weeks and 5 Days Pregnant
    Your baby todayThe ball of cells, known as the blastocyst, that will form the embryo has now completely embedded within the lining of the uterus and the lining has regenerated over it.Unfortunately, in the complex process of conception, only abou...
  • zygote dividing in two
    Week 3 of Pregnancy
    You are 2 Weeks and 3 Days Pregnant
    What's happening insideWhen the two nuclei have pooled their genetic material to create a cell containing its full complement of 46 chromosomes-23 each from the mother and father-the cell can start dividing, shown here at the first division creat...
  • embryo dividing into 16 cells
    Week 3 of Pregnancy
    You are 2 Weeks and 4 Days Pregnant
    What's happening insideThis is an embryo at the 16-cell stage, when it has changed from a zygote into a morula. It is in the process of dividing into a hollow ball of cells-the blastocyst-which will eventually implant in the lining of the uterus....
  • 3 Weeks 5 Days Pregnant Blastocyst
    Week 4 of Pregnancy
    You are 3 Weeks and 5 Days Pregnant
    Your baby todayThe ball of cells, known as the blastocyst, that will form the embryo has now completely embedded within the lining of the uterus and the lining has regenerated over it.Unfortunately, in the complex process of conception, only abou...
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    Book Finder
    Book Finder
    Find our top picks for the best books of the year!
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  • ovary at the end of fallopian tube ready to release egg
    Week 2 of Pregnancy
    Day 14 of your Menstrual Cycle
    What's happening insideThe ovary can be seen here at the end of the fallopian tube. At around this time of the menstrual cycle, a follicle at the surface of the ovary releases an egg, which is swept down the tube by clearly visible fingerlike pro...
  • human egg surrounded by sperm
    Week 3 of Pregnancy
    You are: 2 Weeks and 1 Day
    What's happening insideHere the egg is shown surrounded by sperm. Although only one sperm will fertilize the egg, several hundred are thought to be necessary to break down its defensive layers and enable fertilization to take place. ...
  • 24 hours after conception
    Week 3 of Pregnancy
    You are 2 Weeks and 2 Days Pregnant
    What's happening insideHere is a diagram of a human egg cell 24 hours after fertilization. Around the egg is a thick layer (yellow) that has now become impenetrable. The circles inside, or pro-nuclei, contain genetic material from the mother and ...
  • ovaries on day 2 of menstrual cycle
    Week 1 of Pregnancy
    Day 2 of your Menstrual Cycle
    What's happening insideYour eggs are already developing, as can be seen in this color-enhanced ovary. The small white structures are the immature follicles that contain the eggs at different stages of development. Once one of the follicles mature...
  • sperm cell traveling along fallopian tube
    Week 2 of Pregnancy
    Day 13 of your Menstrual Cycle
    What's happening insideThe sperm cell can be seen here inside the fallopian tube. Since sperm can stay active and alive inside you for up to 72 hours, it's possible to get pregnant even if you don't ovulate for two to three days from now. ...
  • cervical mucus on day 10 of menstrual cycle
    Week 2 of Pregnancy
    Day 10 of your Menstrual Cycle
    What's happening insideAs ovulation approaches, more cervical mucus is produced. Here it has crystallized to form a "fern leaf" pattern. Around the time of ovulation the mucus becomes clear, slippery, and stretchy, which makes it easier for sperm...
  • ovarian follicles on day 8 of menstrual cycle
    Week 2 of Pregnancy
    Day 8 of Your Menstrual Cycle
    What's happening insideHere, three developing ovarian follicles can be seen in white. The inner circle of each is the egg. Of the follicles shown, it is likely that only one will fully mature at ovulation and release an egg. ...
  • cervical mucus on day 10 of menstrual cycle
    Week 2 of Pregnancy
    Day 10 of your Menstrual Cycle
    What's happening insideAs ovulation approaches, more cervical mucus is produced. Here it has crystallized to form a "fern leaf" pattern. Around the time of ovulation the mucus becomes clear, slippery, and stretchy, which makes it easier for sperm...
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    Baby Names
    Baby Name Finder
    Search names and meanings in our Baby Name center.
    familyeducation editors
  • the brain releasing hormones on day 4 of menstrual cycle
    Week 1 of Pregnancy
    Day 4 of your Menstrual Cycle
    What's happening insideIn this color 3-D scan of the human brain, the green central structure is the hypothalamus. This controls emotions and body temperature, and releases chemicals that regulate the release of hormones from the pituitary gland ...