Disable notification listeners firing on app startup

lib/notifications.js

@@ -40,14 +40,16 @@ export default function setupNotifications(navigate) {
         repeatType: 'day'
       })
     }
-  })
+  }, false)
 
   periodReminderObservable(reminder => {
     Notification.cancelLocalNotifications({id: '2'})
     if (reminder.enabled) setupPeriodReminder()
-  })
+  }, false)
 
-  getBleedingDaysSortedByDate().addListener(() => {
+  getBleedingDaysSortedByDate().addListener((_, changes) => {
+    // the listener fires on setup, so we check if there were actually any changes
+    if (nothingChanged(changes)) return
     Notification.cancelLocalNotifications({id: '2'})
     if (periodReminderObservable.value.enabled) setupPeriodReminder()
   })
@@ -77,4 +79,8 @@ function setupPeriodReminder() {
       })
     }
   }
+}
+
+function nothingChanged(dbChanges) {
+  return Object.values(dbChanges).every(changeArray => changeArray.length === 0)
 }
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