Código AlarmManager repetindo cada 3ª semana do mes

/* ALARME 1
        boolean alarme1 = (PendingIntent.getBroadcast(this, 0, new Intent("ALARME_DISPARADO_1"), PendingIntent.FLAG_NO_CREATE) == null);
        if(alarme1){
            Log.i("Script", "Novo Alarme 1");

            Intent intent4 = new Intent("ALARME_DISPARADO_1");
            PendingIntent p4 = PendingIntent.getBroadcast(this, 0, intent4, 0);
            Calendar c4 = Calendar.getInstance();
            c4.setTimeInMillis(System.currentTimeMillis());

            // c.set(Calendar.DAY_OF_WEEK_IN_MONTH,;
            c4.set(Calendar.WEEK_OF_MONTH, 3); // 1 - 4
            c4.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY); // SUNDAY - MONDAY - TUESDAY - WEDNESDAY - THURSDAY - FRIDAY - SATURDAY
            c4.set(Calendar.HOUR_OF_DAY, 21); // 0 - 23
            c4.set(Calendar.MINUTE, 0); // 0 - 59
            c4.set(Calendar.SECOND, 0); // 0 - 59
            //c4.add(Calendar.SECOND, 3); // 0 - 59

            AlarmManager alarme4 = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarme4.set(AlarmManager.RTC_WAKEUP, c4.getTimeInMillis(), p4); // Mesmo dia na 3ª semana
        }
        else{
            Log.i("Script", "Alarme1 já ativo");
        }*/