You should increase the incline at least to 1% - this is to simmulate outdoors conditions (wind, etc.). Believe me, you won't even notice. After a while, try going to 2%.
Unless this was a typo and you really mean 5.2 km per hour, it is only 3.2 mph. It is quite slow, and at that speed and with no incline, you are not burning too many calories. Your specs say you are 102 kg, that's not too bad at all, so you should be able to up the exercise a bit. Although give yourself time - maybe try increasing the speed by 0.1 mph each week - give yourself time to adjust.
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