If you don't know your conception day is pretty helpful. I keep track of my periods and intimacy on my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> app so I know the days I had sex. I just wasn't sure when I conceived so I downloaded this app and it told me I ovulated on the the July 6th so I went back to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> and to my surprise I had sex the day before on July 5th && again on the 9th so it kind of gave me a time frame which is pretty accurate. I just thought I'd share it with you mommies incase you wanted to try it out.