Hello ttc for abou 13 months now! And nada! I feel like I'm always wrong on these ovulation kits. I've tried a few brands but nothing.  I've also downloaded the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Period Tracker</a> and it's always one to two days off. I sometimes feel like the line is not too dark or light.  Which ovulation kits have you used?