Hi Anon and thanks for your question.

Generally speaking, when you have a period, it means you are not pregnant. Spotting between periods is fairly common for women, and can be from residual blood from your last period, or what's called breakthrough bleeding.

You may find the following helpful:

Answers for Women Needing to Know: Am I Pregnant After Unprotected Sex

The only way to know for sure if you are pregnant is to take a pregnancy test.

Hope that helps,

Pam