just give it a few days, it will be obvious what that is, it's too hard to tell right now. and if it is balls, you'll have a bit of time before you have to chop, so it shouldnt be an issue.
its probably new growth, give it a few days like tm says it will be much easier to tell then.. but I really think it is more likely a lil new growth if you are still vegging... what kinda lights do you have and on what light cycle?