Firstly you aren't doing anything wrong in discarding the first droplet and taking the measurement using a second droplet. This is exactly what you should do, as the first droplet is notorious in giving inaccurate results due to the blood sample being perhaps laid static at the point where the lancing needle first penetrated the skin.
Most meter manufacturer's fail to mention this but you are doing the right thing in using the second droplet that subsequently forms.
As for squeezing or taking yet another drop, well it's as urbanracer rightly says, it will vary somewhat, sometimes by just a small amount and sometime by a larger amount.
It's best to always stick with a similar routine (using the 2nd droplet) and even if your meter has errors within the + to - 15% range, in reality it doesn't really matter too much as its the overall trend over time that you are more concerned with.
The phrase 'Eat to Your Meter' applies equally well whatever error there is on your meter If you are particularly concerned over the meter error issue, it might be worth obtaining a glucose sample solution from our meter manufacturer and finding out where your particular meter lies in the error band so that if you know for instance that it's readings are 10% high than you can make the necessary mathematical adjustment so that you get a more accurate result.
Incidentally a reading of 4.8 mmol/L before eating is fine and isn't too low (unless your meter has a 15% or 20% error which is most unlikely. For a Type 2 diabetic a perfect reading is actually 5.8 mmol/L consistently all the time 24/7 something that's impossible to achieve..
