I doubt your pregnant
you seem to be having a normal period now
i've never taken the test while bleeding
but i doubt that would mess up the results
but when it ends you should test again.
I doubt it is your period that caused the faint line to appear on the test. You might have had a chemical pregnancy and miscarried on the 24th. From what I have read, this happens to quite a few women, and many wouldn't even know they were pregnant because it happens very early, right around the time their period is due. That said, you should probably take another hpt in a week or so, just in case.