Pregnancy Snapshot

1 to

2 weeks pregnant

For a brief summary of development events during various
stages of pregnancy, choose any age* range from the drop-down menu.

(*Ages are referenced from time of conception or fertilization,
not from the beginning of your last menstrual period. One month equals 4 weeks.)

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Movie clip from The Biology of Prenatal Development. Buy Now!


Cells in the womb near the embryo are loaded with nutrients. The amniotic sac begins forming. (10 days) Implantation is complete and the placenta is starting to form. (12 days) The embryo is now symmetrical about the midline. (13 days) • The hormone hCG triggers a positive pregnancy test. (8 days) • germ cells, which will form eggs in girls and sperm in boys, are present.

*All prenatal ages are referenced from the time of fertilization (or conception).
One month is defined as exactly four weeks.