This section will be brief because there is not a whole lot of information available about implantation spotting. There are no scientific studies that have been done (that I am aware of) about implantation spotting.

Implantation is when the newly fertilized embryo attaches itself into the wall of the uterus. When this happens (anywhere from 5 to 11 days past ovulation) the embryo starts to produce the pregnancy hormone hCG- pregnancy tests are designed to pick up on this hormone.

Sometimes when implantation occurs, a small amount of spotting can be seen. Not everyone gets implantation spotting and there is no way to tell if you will have it. Some women who have been pregnant more than once may not have it, or may only have it once. There is no pattern to implantation spotting.

The spotting can be red, brown, or pink. It can be watery and very minimal. Implantation spotting isn't heavy, nor is it a sign that something is wrong. Many women can mistake it for their period.

Most women notice it when they go to the bathroom because there is such minimal bleeding it might not be evident any other time.

Some women notice a small amount of cramping with implantation spotting, thus making it harder to decipher it from their periods. Cramping is common in the luteal phase, so it is not proof of implantation if you are cramping.

There are no rules to implantation spotting other than it not occurring before 5 days after ovulation because the egg has to have 4-5 days to prepare and travel down the fallopian tubes into your uterus.