Glow doesn't adjust ovulation, so I started using several apps. I'm going to use then over the next few months along with glow to see howI'm doing. In December AF lasted from the 20th-31st, I got a positive OPK on January 21, according to glow I was supposed to ovulate January 8th, as of today still no period, and a negative pregnancy test. I am just really frustrated because my period is so crazy that <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> is stressful.