There are a number of reasons for bleeding in between your periods and you can read this article by Merely Me, a writer and community leader for this site, titled, Bleeding In Between Periods. What Does It Mean?
One other article, by Merely Me, which might help is called, Am I Pregnant? How to Know? Within that article is a mention and explanation of Implantation Bleeding, which may or may not apply to you.
If your normal period is more than a week late you can take a home pregnancy test, or be tested by a doctor. Those are the only two reliable ways to know if you are pregnant. Good luck to you.
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