How can you use ovulation calendar method?

Calendar: No one wants to answer this question because it's very iffy in our opinion. I think the apps on the phone are fun and make you feel like you're doing something but probably have limited value. What you should know is 1. You ovulate 14 days before your next. I.E. A 16 on a 30 day cycle 2. Around the time of ovulation you should see changes in your mucous 3. Look for cramping or pain on the right or the left.