Confusing menstrual struggle...

My period use to be spot on, and according to the glow app I am a week late. I had some cramping yesterday and today had light spotting, with extremely watery mucus. Not enough to need Tampons but I still put on in and over about 4 hours I only had a drop of blood on the tampon. My period has been getting lighter but this is so small that I can barely tell besides the cramping and emotions.