Curious

​Lately I've been feeling very different. My menstrual came right on time in July and August. I usually get my menstrual late in the month rolling into the next month. Now I just got my menstrual a wk and some days early. I was spotting for the first 2 days and now it's been coming down a little heavier. I took a pergenacy test last wk and it came back negative. Since I've been getting my period it's always been on time and always last a full 7 days. I'm a little concerned as to what's going on, I made an appointment with my Gyn but that's not until mid October. I would really appreciate some knowledge or just general information if anyone may have a clue or may have gone through something similar.