Pregnancy starts after implantation. Following changes occur during pregnancy.
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Implantation happens early in the pregnancy stage after the fertilized egg (zygote) travels down the fallopian tube to the uterus and adheres to the epithelium, or uterine lining. It takes about eight to 10 days for the fertilized egg to travel to the uterus. During that time, it develops into a blastocyst through several stages
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