Great question: In most cases we do not know. Some reasons: 1) poor quality, old, or abnormal embryo, some estimate only 1 embryo in 4 will be successful, 2) inappropriately developed endometrium, which can happen if too much/too little Progesterone before transfer, 3) bad placement or rough/difficult transfer. Many things we still do not know!
Answered 10/5/2018
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A doctor has provided 1 answer
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2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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