Early sex or just normal growth?

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This is my first grow, I'm working with bag seeds, a couple 42 watt CFL, and a small 70w HPS. The plants are 2 weeks from seed and where the first set of leaves attach to the stem there are small growths. On 2 plants it is a distinct V shaped growth, and another appears to have a small ball. I had the plants going 24/0 for the first week, then adjusted to 18/6. I didn't think the plants would respond that early so I'm wondering if this is just growth or a pre-flower?
 
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