The fertilized egg (zygote) continues to divide, becoming a ball of cells called a blastocyst. Around day 9-10 after fertilization, the blastocyst implants into the uterine lining.
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You may not feel any different yet. Some women experience light spotting (implantation bleeding) when the embryo attaches to the uterine wall.
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Continue with healthy habits. Avoid alcohol, smoking, and limit caffeine intake as these can affect early development.