Advice?

I started my period 11 days early (which is odd, I'm usually on time.. at most a day early then expected or a day later then expected.) &my 1st Day Of my cycle is ALWAYS extremely heavy.. but instead my first day was extremely light.. then the next day (day 2) in the afternoon I became extremely heavy... 3rd day I would say "spotting" would be the best description of how light I was, I didn't wear nor did I need any tampons or pads.. &then (day 4) this morning I went pee and I was medium bleeding.. I went back to sleep and woke up and haven't needed any tampons or pad again.. I took a test the day before my period (due to many reasons/ symptoms that were similar to my first 2 pregnancies) what is this? Why