3 Days Late But NO BFP


I'm starting to freak out a little, but trying not to. I just wanted to cry this morning when another test came up negative though. According to my Glow chart my period is now 3 days late but I'm still testing negative. I had some very light (more pinkish than red) spotting 2 days ago on the 24th and 25th (last month my period started on the 24th) but that has stopped entirely now. I'm urinating VERY frequently and have mild headaches throughout the day, fleeting moments of vague nausea, and i feel like i can smell EVERYTHING around me. What the hell is going on with me that I could be experiencing all these symptoms, my period be late, but not be testing positive?? Please guys, I definitely need some advice or just thoughts on what could be going on here.