Ovulation Question

This is the first time posting anything, but I thought I would try and get some advice here... Glow says I should be ovulating today. My fiancé and I have had sex the last three days and today, I got what I thought was the start of AF. It started as a light brownish blood. It was light and I ignored it. Through the day it became a brighter red but still not heavy. Now it is almost like I am starting AF, which is confusing because I have been regular for the last 12 months and now when I should be ovulating, I'm not?!?!