Beginning of period or implantation?

This is the 3rd day of my missed period. (I have irregular periods normally) so my question is this is the second day that im having the lightest brownish pinkish discharge or spotting and i want to know if this might be my period coming? When ive gotten the brown discharge before my period its been way more than what im currently having. I got a Vvvvvfl on a pregnancy test. So im confused by all this. Please help. TIA