We just recently started to TTC #2. My cycle can vary between 26-31 days. I've set the app to 28 days since that's what i averaged after a few months. Based on my weird cycles I'd have to have sex like 7-8 days straight to cover the wide range of days I could ovulate! Yeah sure sounds great now, but I'm sure it'd get boring and seem like a chore very fast. We had always just planned on stop using condoms/pulling out at when it happens it happens and not get crazy with ovulation tests, but now it seems that's the only thing that would help guarantee when I actually ovulate.