I had an on-and-off sore throat the first month or two, and some days the pain was pretty bad, but i could tell it wasn't strep or me getting sick (it was a different kind of pain.) It isn't uncommon and severity varies by person. I've also heard it can happen randomly throughout the first year as your chords settle.
If it persists, or there are any other symptoms, it probably wouldn't hurt to talk to your doc about it. Rule out it being strep (don't have to have the white spots or even redness to have strep - i used to get it all the time without those, and occasionally without fever) or flu. If the doc says it's just the chords changing then at least you'll know!