Confused!! What is going on?? TMI for some

So about 10 days post ovulation I took a pregnancy test and it was a VERY faint positive. On the 19th (4days before my period was supposed to start) I started having weird brownish red bleeding. TMI I know. But it is unlike any period I've had! I was supposed to start the 22 and still nothing. I took another test this mornin and a very faint positive again. Like you can barely see it. Should I wait or test again? Now my stomach has the aching dull pain and I'm having lower back pains.