Weekly button is now updated

BeSafePlus/ViewModels/ActivityHistoryViewModel.cs

@@ -125,7 +125,13 @@ namespace BeSafePlus.ViewModels
         public IRelayCommand NextWeekCommand { get; }
         public bool CanNavigateToNextWeek()
         {
-            return _currentWeekOffset < 0;
+            var today = DateTime.Now;
+
+            var endOfCurrentWeek = today.AddDays(-(int)today.DayOfWeek + 7);
+
+            var endOfSelectedWeek = today.AddDays(_currentWeekOffset * 7).AddDays(-(int)today.DayOfWeek + 7);
+
+            return endOfSelectedWeek < endOfCurrentWeek;
         }
         public async Task LoadWeeklySteps()
         {