I used Glow to track my periods. We had sex 3 only times using the app and it worked! I then use <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">Nurture</a> during pregnancy and had my baby a DAY before my due date. Now, we plan on using the <a href="https://play.google.com/store/apps/details?id=com.glow.android.baby">baby app</a> for our newest family member. I great app and great experience!!!