Pregnant?

Was fertile October 3-9 or 10.. Had unprotected sex on the 6th. Then the following week (about the 15th or 16th) I got flu like symptoms but never puked. I had a fever and my whole body ached & had an awful headache. My period is suppose to come this Wednesday. I've been having a lot of headaches recently though which is odd for me. Anyway, so Sunday I noticed some light blood but didn't think anything of it. I had sex and then when I went to the bathroom there was like 3 drops of blood. Not small little drops, like 3 blobs kinda but not blobs. So I thought maybe my period is coming early.. But now today I had hardly any blood and now I am down to no blood at all. Does this mean I'm pregnant? Or maybe my period is just being weird...?