How do you know if implantation bleeding is normal and complete?

You don't: Implantation bleeding doesn't give you much indication as to how the pregnancy will proceed. Since most miscarriages occur due to chromosomal abnormalities, it's impossible to tell at implantation whether the pregnancy will be successful (unless you are doing ivf).

You can't tell: Implantation bleeding is not that common but can occur around the time of implantation. It is usually light. And I am not sure what you mean by implantation bleeding being complete.

I'd ignore it: I agree with the prior answers, but - 'implantation bleeding' is subtle and unpredictable, if it can reliably be interpreted at all. Internet buzz vastly over-emphasizes the idea of 'implantation bleeding' and how useful a predictor it is. I suggest a reliable pregnancy test 11-13 days after ovulation, you'll have the truth.