Any advice welcome please TMI

So AF came today (or so I thought) I wore a pad and it literally only has the smallest brown dot on it. My periods are very regular and I can almost predict down to the hour when it will start and it never starts out brown. And now there is only a very light amount of brown kinda slimy looking blood. I'm 24 and I'm just wondering if my body is going through some hormonal changes as my skin has changed a lot within the past couple months or is there still I slight chance I could be pregnant?? Please any advice is welcome.