In case anyone missed the point of chud's rather terse comment, the picture he posted has the fem flowers clearly marked. Thanks chud.
There are three stages to flowering
1. Showing sex. This can happen in the veg stage if the plant is mature enough or it can be triggered by 12/12
2. Stretch. Rapid vigorous growth. Before showing any buds, the plant may double or triple in size. Most of the plant's green growth happens in this phase. Nodes will show one or two fem flowers but no clusters.
3. Budding. When this starts, the growing tips which had been producing only new leaves now show a mix of leaves and flowers. Following this, clusters of flowers start appearing on all the nodes, new shoots stop appearing and green growth is limited to producing leaves for the buds.
Everybody loves phase #3. Things happen faster and faster. It get's quite dramatic and you can finally see the bud you are going to get!