Implantation spotting begins approximately six to twelve days after the ovary releases the egg. This length of time may differ depending on how long the egg takes to move down the fallopian tube and attaches to the uterus. You can find more information here: pregnancy.lovetoknow.com/wiki/When_Does_....
Implantation (or conception) occurs the minute the sperm has penetrated the egg. This usually happens within 24 hours of ovulation, although the body will not know it's pregnant until the egg has attached itself to the uterine wall - some 5-12 days after ovulation.
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