You need a new picture to see it clearly, right now it could be anything.
Look for white hairs over all nodes, look closely they come out of a little oval.
Look near top of plant for 'balls' males show ball build up much faster near the 'colas' of the plants and becomes easily visible when they build it (it happens quickly).
Females you can think are males, but as long as each node side has 1 ball, it still could be both.
Make sure you feed light bloom nutes to help the process along, it might slowed right now if you havent.