You could very possibly be pregnant. I would say take a hpt. If it comes up negative then wait a couple of weeks and test again. If it stil comes up negative and you truly feel that you are pregnant, then make an appt for a blood test. Good luck
You may finally be getting your period. If you had sex on the 9th I would wait till OCt. 9th to test.
Take a HPT test. Or see a doctor for bloodwork. the bloodwork checks for the pregnancy hormone and it will let you know exactly where you are at in your pregnancy... if you are pregnant.