You can see your two week total driving on the tacho at any time. You will notice that on a Monday the driving for the week before last is wiped off the total. Depending on the tachograph, just press up or down to see it. Hope this helps.
If you are working five days and not resorting to your 10 hours driving you are safe. If you start doing a sixth day while hitting your driving limits daily, you will most likely run into trouble.