I agree with athos, its early but those look fairly long and thin. Ive come to find the males look more short and round like a spade symbol from a deck of cards. As soon as any pistils pop out you'll be certain. I believe males can show their preflowers a week or 2 sooner than female preflowers do, around 3-4 weeks, females 4-6 weeks
Your plant looks great already, I love that you're doing regular seeds and not Feminized. I hope the mystery turns out positive. :)