google Bract - pistil - stigma - marijuana. lots of pictures.
a bract is the thing that plumps up. pistil is the skinny green part near top and stigma projects out of the pistil. These may not come out in vege, but typically do show at some point on more mature plants -- if the nodes start growing asymetrically, they'll likely show soon if not.
now, you will find 'preflowers' at any node. A male part (stamen / anther) will look similar early on. it will eventually grow out on a stem-like projection from the nook.. this is a major difference in addition to the white projecting hair of famale bits (stigma).
"grapes" are bad.. if it stays a little nub firmly in nook of node, then projects a hair, it's good.