Many of us have 'foot on the floor' effect, where your liver thinks it's being helpful and dumps glucose in our bloodstream upon getting out of bed to get us going for the day, could be that.
It can also be the second reading was the same as the first, 13.2 to 13.7 easily falls within the margin of accuracy for a glucose meter.
It may also be that it takes a bit more than an hour to see the effect of the Novorapid, I know it does for me.