Calibration matches begin at your unranked MMR, so unless the concept of "omg noob team holding me back" doesn't apply to unranked MMR then the timing of your calibration matches are unlikely to make a huge difference.
Yeah but I kinda mean I started playing ranked when I was about 150 games played. I wish I stayed out until I knew more about the game and could react quicker to situations. Now it just seems to be me shouting at the screen "why did you run in!" to people. I seem to be put against people that still don't know what Bloodseekers ulti does for instance. Tis no fun.