What is Implantation Bleeding?

I asked a question and responce be " implantation bleeding"
maybe,if you look at my other question you will see.but i really just want to know what it is?
Answers:

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When the egg becomes fertilized near a sperm at the time of ovulation it begins traveling down the Fallopian tube towards the uterus. During that time the fertilized egg multiplies into first 2, later 4 and then 8 and more cell. The fertilized eggs which is know as the "blastocyst" enters the uterine cavity going on for 5-6 days after fertilization and attaches to the lining of the uterus inside 1-2 days after reaching the uterus.

Implantation is the attachment of the fertilized egg when the fertilized egg (now called a blastocyst) have completed its travel through the fallopian tube and attaches to the lining of the uterus. Implantation happen about a week after ovulation beside a range of 6-12 days after fertilization.

The blastocyst is a cluster of tiny cell, smaller than the head of a pin. Most women own no symptoms on that day.Some women report some spotting or bleeding around the time of implantation. Most women report this bleeding to be brown in color though some mention it to be more rosy. Most women report at most a few drops of blood -- maybe one to two small red or brown spots contained by the panties, though others report a more substantial amount but rarely if ever does it approach the appearance of menstrual bleeding. If your bleeding is similar to a menstrual term chances are that it's not implantation bleeding.

It's feasible that most women who do become pregnant do not experience implantation bleeding, and many women experience some spotting but they are not pregnant.
If you experience bleeding regularly after ovulation and you are not pregnant after you may want to discuss with your doctor whether some test can be done to make sure everything is OK.

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Implantation bleeding can occur when a fertilized egg implant itself into the uterine lining.