I am now 12 days late yesterday I started spotting like pink, have been having some cramping going…

I am now 12 days late yesterday I started spotting like pink, have been having some cramping going on (but not as bad as my period cramping), severe lower back pain to where I'm almost in tears everyday, nausea, and breasts hurt really bad. I have taken a pregnancy test a few days again but the line that goes across was already on the pregnancy test when I took it so I think it was a dud. so I'm waiting til I stop spotting to take another test.