Yea I don't think it's showing sex yet, and it probably won't, because it's probably not mature enough yet. You need to amp that lighting up, or else you won't get any results at all. Invest in a bunch of CFLs - that thing needs waaaay more light. At 7 weeks it should be so much bushier or taller than that. Plus those lights need to be closer (3" from the tops of the plants). And beyond week 4 you should be giving nutes at 1/4 strength.