Wot's the shortest time a woman's body can prepare and slough off the uterine lining if not pregnant, or protect the lining of the uterus if conceived

Unusual : Question. The time to slough off the lining totally depends inn its thickness and strength of uterine contraction from prostaglandins . If say 1 day in a person on some type of pill . On the contrary from the moment of conception the lining is prepared and maintained until birth when it it is then sloughed an that takes about 6 weeks. Hope that answers your question