Conflicting pregnancy tests?

My period should start tomorrow, but I was feeling really off, sore back, sore breasts, weepy and nauseous (beyond my usual PMS symptoms) so I decided to test yesterday. The first test had a super faint positive. So I decided to wait and test again the next morning. I did and got super negative. Anyone else had conflicting tests before? I have had a chemical pregnancy before so maybe it is happening again... I am going to test tomorrow morning again if my period doesn't start. This waiting is killer though I just had to get it off my chest since I don't want to let my husband know yet.