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the fertilized egg will start dividing into multiple cells as it travels down the fallopian tube, enters your uterus, and starts to burrow into the uterine lining.
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This ball, called a blastocyst, has begun to produce the pregnancy hormone hCG, which tells your ovaries to stop releasing eggs.
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The bag of cells is now called embryo. It's around this time – when your next period would normally be due – that you might be able to get a positive result on a home pregnancy test.
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The circulatory system is beginning to form, and the tiny "heart" will start to beat this week.Your baby is the size of a sesame seed.
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Your baby's nose, mouth and ears are starting to take shape, and the intestines and brain are beginning to develop.
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Little hands and feet that look more like paddles are emerging from the developing arms and legs.
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Nerve cells are branching out, forming primitive neural pathways. Breathing tubes now extend from his throat to his developing lungs.
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Her embryonic tail has disappeared. She weighs just a fraction of an ounce but is about to start gaining weight fast.
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His skin is still translucent, but his tiny limbs can bend and fine details like nails are starting to form.
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His fingers will soon begin to open and close, toes will curl, and his mouth will make sucking movements. He'll feel it if you gently poke your tummy – though you won't feel his movements yet.
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His fingers will soon begin to open and close, toes will curl, and his mouth will make sucking movements. He'll feel it if you gently poke your tummy – though you won't feel his movements yet.
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Your baby's tiny fingers now have fingerprints, and her veins and organs are clearly visible through her skin.
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His kidneys are working now, too. If you have an ultrasound, you may even see him sucking his thumb.
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She can sense light. If you shine a flashlight on your tummy, she'll move away from the beam. Ultrasounds done this week may reveal your baby's sex.
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His legs are more developed – find out when you're likely to feel your baby kick! His head is more upright, and his ears are close to their final position.
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Your baby can move her joints, and her skeleton – formerly soft cartilage – is now hardening to bone. The umbilical cord is growing stronger and thicker.
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Your baby is flexing his arms and legs, and you may be able to feel those movements. Internally, a protective coating of myelin is forming around his nerves.
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Your baby's senses – smell, vision, touch, taste and hearing – are developing and she may be able to hear your voice. Talk, sing or read out loud to her, if you feel like it.
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Your baby can swallow now and his digestive system is producing meconium, the dark, sticky goo that he'll pass in his first poop – either in his diaper or in the womb during delivery.
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Your baby's movements have gone from flutters to full-on kicks and jabs against the walls of your womb.
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Your baby now looks almost like a miniature newborn. Features such as lips and eyebrows are more distinct, but the pigment that will color his eyes isn't present yet.
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Your baby's ears are getting better at picking up sounds. After birth, she may recognize some noises outside the womb that she's hearing inside now.
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Your baby cuts a pretty long and lean figure, but chubbier times are coming. His skin is still thin and translucent, but that will begin to change soon too.
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Your baby's wrinkled skin is starting to fill out with baby fat, making her look more like a newborn. Her hair is beginning to come in, and it has color and texture.
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Your baby is now inhaling and exhaling amniotic fluid, which helps develop his lungs. These breathing movements are good practice for that first breath of air at birth.
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Your baby now sleeps and wakes on a regular schedule, and her brain is very active. Her lungs aren't fully formed, but they could function outside the womb with medical help.
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Your baby's eyesight is developing, which may enable her to sense light filtering in from the outside. She can blink, and her eyelashes have grown in.
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Your baby's muscles and lungs are busy getting ready to function in the outside world, and his head is growing to make room for his developing brain.
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Your baby is surrounded by a pint and a half of amniotic fluid, although there will be less of it as she grows and claims more space inside your uterus.
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Your baby can now turn his head from side to side. A protective layer of fat is accumulating under his skin, filling out his arms and legs.
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Half of that goes straight to your baby, who will gain one-third to half her birth weight in the next seven weeks in preparation for life outside the womb.
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The bones in your baby's skull aren't fused yet. That allows them to shift as his head squeezes through the birth canal. They won't fully fuse until adulthood.
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Your baby's central nervous system is maturing, as are her lungs. Babies born between 34 and 37 weeks who have no other health problems usually do well in the long run.
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Your baby's kidneys are fully developed, and his liver can process some waste products.
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She's also losing most of the fine down that covered her body, along with the vernix casosa, a waxy substance that was protecting her skin until now.
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Over the next two weeks his lungs and brain will fully mature.
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Her irises are not fully pigmented, so if she's born with blue eyes, they could change to a darker color up until she's about a year old.
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Your baby's physical development is complete, but he's still busy putting on fat he'll need to help regulate his body temperature in the outside world.
