When the fertilisation takes place then after few days the zygote formed comes into uterus of woman and it passes some time in uterus... after that it is called blastocyst and it gets embedded into the uterus wall of mother's womb This is called implantation...
pregnancy... when the embedded blastocyst develops then it bears placenta..and when it start to develop and mother's womb start to increase in size it is called pregnancy.
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welcome Subhan.
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