Is this plant already stretching?

Hia Whatyouwant... i would not say that it is already stretching out for light. In a single variety under the same conditions out of 10 seeds I got 2 stretching out, 2 really short, and 6 that were average, like yours I would say. However I would also say that it is a little early to be sure. To make the most of this seed use as much light as you can in terms of power and time, water little and avoid nutrients . This way you should not worry of anything. Enjoy the growth.