^Nah, it's not an auto-flower, it's normal for most strains to show preflowers, not long after the 4th week of veg.(whether 18/6, 20/4, 24/0, etc...) Also, the "stems" on the balls are normal, too. Actually, those are what I look for, when they preflowers are
really small, because female preflowers(calyxs) don't have them, making them easy to distinguish from each other. If a preflower has a stem, it's going to be a sac. If it starts wide, then tapers to a point, it's going to be a female. Once in awhile you run into some that are iffy, but not too often.