Undefinitive, but looks like a MALE to me...In my experience, both male and female preflowers kinda of start out the same(and sometimes are mistaken for a new node). If you dont see little small white hair sprout from any of the bulb looking structures after about another week, it is, in my general experience, that it is safe to assume a MALE. That being said I havent had balls sprout in the past 2 grows using this judgment, but that is not to say i didnt throw out a possible female, either.
If you are limited on seeds, or actual live growing plants, you may want to just keep waiting it out to be 100% safe.