If your laptop has been on, but you haven't been doing anything with it, there's not necessarily any reason that your data usage reflection would have changed from the 1.8GB it reflected three days ago. If no data has been used over these last three days, it wouldn't show any change.
If that's not the problem you are trying to convey, please elaborate. It's a little difficult to tell from the limited information given, so that was a best logical guess.
AMD FX-6100 | Samsung 250GB 840 EVO SSD | Western Digital Blue 500GB HDD | 16GB DDR3-1866 | EVGA Geforce GTX 550ti | Windows 10 Pro 64-bit