CONFUSED!!!

Last Monday I had very light spotting with stretchy EWCM, the next day I had more light spotting. For two days it was a little heavy. Then light spotting again with EWCM. I have a drs appointment tomorrow but what could this be??? Today is Monday btw. I thought I was preggers but when I saw the blood I guessed I wasn't but since I'm still spotting what does this mean?