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The first trimester begins on the first day of your last period and lasts until the end of week 12. During this trimester, an amniotic sac forms around the fertilized egg. It helps cushion the growing embryo throughout pregnancy. The placenta also develops.
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Two-week period after conception, when formation of placenta occurs
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A sperm cell combines with an egg cell to form a zygote
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36 hours after conception, the resulting ball of cells moves along the mother’s fallopian tube to the uterus.
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7 days after conception, takes about a week to complete. The ball of cells starts to become embedded in the wall of the uterus.
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Lasts from the end of the germinal stage to two months after conception. In this stage, all the major organs form, and the embryo becomes very fragile.
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The developing ball of cells. At the end of the embryonic period, the embryo is only about an inch long.
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Lasts from two months after conception until birth
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The span from week 13 to week 27 of pregnancy. Typically, nausea subsides, emotions even out and sex drive returns. It's also the time when you'll start to feel the baby's first movements.
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1 month into this stage, the fetus quickly grows as bones and muscles form, and it begins to move inside the uterus. Organ systems develop further and start to function.
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Time span from 28 weeks till the babies birth. During this trimester, the baby can blink their eyes, their wrinkled skin is starting to smooth out as they put on baby fat, and they're also developing fingernails, toenails, real hair, and adding billions of neurons to their brain.
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Last three months, the brain increases rapidly in size, an insulating layer of fat forms under the skin, and the respiratory and digestive systems start to work independently
