Cm right after period.

My last period was October 20-25. I had CM on October 27 and the 30th. My fertile window (according to Glow) is November 3-9 and I haven't had any CM. I had sex on both the days I had CM which was within a week of my last period. Was that my fertile cycle? I thought there was at least 1 week between period and your fertil cycle.