Spontaneous conception is the conception and birth of a child naturally, without the use of in vitro fertilisation or other forms of assisted reproductive technology.
There is an overall 18% chance of spontaneous conception after an in vitro fertilization (IVF) treatment, but that chance rose to 37% among younger women (less than 27 years).
The likelihood also depends on the sperm performance of the man and the egg count of the woman.
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