um totally confused.

Hubby and I have been NTNP for the last 7 months or so. Well my last proper period was September 27th. I was due to start my period October 25th, and at 6 days late, I started spotting. I had a light bleeding the next day that only required one pad the whole day, and then more spotting for 3 more days. No clots or cramps either. I'm also super regular, with a heavy period and typically lots of clots. I took a test at 3 days late that was negative and figured I wasn't pregnant, but now I'm wondering. someone have something similar happen to them, and how did it turn out?