Spotting all month

Ka

Not sure what's causing my Spotting, I was worried I might be pregnant (last time I had sex was a month ago, I've been on the pill for 6years) but I just got my period on time. My lifestyle hasn't had any big changes that I think would affect it. Anyone have any ideas what may be causing it? Should I wait and see if after my period the spotting continues before I get worried?