Maybe baby

Yesterday I posted that I had realized that I was late for my period by 4 days and thought this may be due to stress or possible pregnancy. This morning I took a test and the results were clearly negative. However I came home from work and had an urge to recheck the same test and there is now a faint plus sign that you really have to look to see. I'm now second guessing the negative. What do you ladies think ? I'm preggo or not?