Reverend

I have this problem myself right now, so I've done a butt load or research. The bottom line is that the early stages of pre-flowering is too early to tell for sure if you have a male or female. I have, however, compiled the BEST graphics available (at least that I've found) to help all my peeps out there make the best judgement on the sex of their plants. Thanks to Old_Phart for a couple of these (from his link). The others, I can't remember where I found them, but props to the person who did them and supplied them.

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"Never a dude like this one. He's got a plan to stick it to the man" - Superfly

Current growing disaster
My old GJ thread WITH PIX All Fluoro, Soil, Bagseed Grow (The new Thread with Pictures)
agent86's sweet-arsed germination guide (read for success, ignore for failure)
How to Tell Males vs Females
Want more females? Here's How...
When to Harvest