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Step 1
Outward physical changes. You may notice a little spotting in week 3 due to implantation of the fertilized egg into the lining of the uterus. Some women notice a slight cramping on one side, but most women won't even be able to distinguish any real changes for a few more weeks.
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Step 2
Inward physical changes. Your uterus is thick with blood and tissue, making it a perfect nesting place for a newly fertilized egg. Amniotic fluid is starting to gather together and it will soon become the amniotic sac.
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Step 3
Emotional changes. If this is a planned pregnancy, you are likely experiencing a mix of emotions, from concern about whether this time you'll conceive, to excitement about the possibilities.
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Step 4
Baby changes. At week 3, the baby is not much more than a cluster of cells no bigger than the letter "o" and rapidly growing and arranging itself. Remember that you've contributed 23 chromosomes and your partner has contributed 23 chromosomes.









