Not sure how low you went...2 semitones would equal 1 whole tone I guess, so assuming it came in standard, making your current pitch in D? Regardless, going too low on any axe will cause some buzzing cuz the strings just aren't tense enough. I'd stick with standard or just one down to E flat. Although you might look at your bridge and see if yer action can be adjusted.

I'd definitely suggest looking into buying a tuner of some sort. It's quite possibly the most overlooked skill of beginners (and some vets). Having a needle tell you where you are helps. I also love using tuning forks, but again that requires a good ear for the rest of the strings.