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Week 1 and week 2
During week 2 fertilization happens, a woman ovulate and the egg is fertilized withing 12 to 24 hours later if the sperm penetrates it. Over the next several days, 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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The 3rd week
Now nestled in the nutrient-rich lining of your uterus is a microscopic ball of hundreds of rapidly multiplying cells that will develop into your baby. 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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Week 4th and 5th week
4th - Your ball of cells is now officially an embryo. You're now about 4 weeks from the beginning of your last period. 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. 5th - Your baby resembles a tadpole more than a human, but is growing fast. 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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Week 6th through week 7th
During week 6: Your baby's nose, mouth and ears are starting to take shape, and the intestines and brain are beginning to develop.
Your baby is the size of a lentil. During week 7: Your baby has doubled in size since last week, but still has a tail, which will soon disappear. Little hands and feet that look more like paddles are emerging from the developing arms and legs.
Your baby is the size of a blueberry. -
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Week 8 to Week 9
8- Your baby has started moving around, though you won't feel movement yet. Nerve cells are branching out, forming primitive neural pathways. Breathing tubes now extend from his throat to his developing lungs.
Your baby is the size of a kidney bean.
9- Your baby's basic physiology is in place she even has tiny earlobes. Her embryonic tail has disappeared. She weighs just a fraction of an ounce but is about to start gaining weight fast.
Your baby is the size of a grape. -
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Week 10 and Week 11
10-Your embryo has completed the most critical portion of development. His skin is still translucent, but his tiny limbs can bend and fine details like nails are starting to form.
11- Your baby is almost fully formed. She's kicking, stretching, and even hiccuping as her diaphragm develops, although you can't feel any activity yet. -
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Week 12 and Week 13