If your phone is running a more recent version of Android, Jelly Bean or later you can get a log of notifications that have pushed by various apps. Here’s how.
Go to your Android home screen and tap the apps icon. Switch to the Widgets tab, tap and hold the 1×1 Settings Shortcut and place it on your your home screen. Now select “Notifications” from the available choices.
Tap the settings icon that you have placed on the home screen and it will display the notification history in reverse chronological order. You will know the name of the app that pushed the notification, the title of the notification and the time when that message was pushed.