Depends on genetics, past attempts, there’s not a straight precent there’s a lot of factors.
It's called Implantation
Implantation is when the fertilized egg enters the endometriosis, or uterine lining, and burrows into it in order to begin cell division.
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Hope this helped!
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No we all have a voice inside your heads
I hope that this helps however if you still think that you are maybe talk to your doctor
B-attractive forces between particles