Some colleges and scholarships will only consider scores from junior or senior year.
A handful of colleges require you to submit ALL test scores (last I heard it was Georgetown, Yale, and Carnegie Mellon). Those things change on a dime, though, so you really have to look at the admissions web page at colleges of interest.
No, it’s not bad to take the test this early, but there is no advantage to it. If you only doing it because you are curious as to how well you would do, just take a practice test instead. If you need a score in order to apply to a summer program next year, I would postpone until December or the spring.