(Am I psychic?)
Hon, there is no way for me to know if you're pregnant. There is not even a way for a pregnancy test to know if you're pregnant, at this point.
I can tell you that according to What's The Risk? - Five Easy Pregnancy Risk Assessment Flow Charts:
Did you have unprotected penis-in-vagina intercourse (no condom, no other birth control of any kind) during menstruation?
If you DID, then you have a LOW to MODERATE risk of pregnancy. See your health care provider as soon as possible for a pregnancy test/Morning After Pill and an STD screening.
you have a pregnancy risk. However, it's now past the recommended 0-100 hour window for you to get emergency contraception. So what you can do is wait another week and take a pregnancy test, and at that time, it will be time for you to see a health care provider for a full STD/STI screening.
See these, for future reference:
Safe, Sound & Sexy - A Safer Sex How-To
Ready or Not? - The Readiness Checklist
"And when the answer that you want/Is in the question that you state/Come what may..." - Coheed and Cambria, "Blood Red Summer"