Really need advice.

So around 4-5 days before my expected period I experienced some light spotting. It first started super pink then went to brown. It only last 2 days then stopped completely. I am now one day late for my period and no signs of any bleeding or anything. Since I had that light bleeding 5 days ago I’ve been super bloated, gassy, and have had cramping in my lower abdomen. My back has also been aching and I’ve been super tired and nauseous and constipated. I took a pregnancy test yesterday on the first day of my missed period and it was negative. Is it possible that it was just too early to test even though my period was due that day? Could I still be pregnant?