If you had only one questionable calyx or pollen sac I would just to you that you have to wait and see what it does. The calyx or pollen sac is obviously what we are examining to determine which of the two it is. That plant is gonna go ahead and be a male 99%. the 1 % I leave for error that there could be some mutation that could possibly cause a cluster of calyx, but this would be something I highly doubt would ever happen and definitely have never heard of, but the difference in shape even if it was a mutation lessens the possibility of even that miracle happening by lets just say that its more or less impossible. Male pollen sacs cluster while as a calyx will be single. You can tell those are pollen sack due to the rounded shape where as a calyx will look similar but will have a point. Basically take a circle, which is your pollen sac, and then put an upwards facing triangle on top of the circle and there is your calyx. Another thing I notice while determining sex is that a pollen sac is noticeably rounder in circumferance like a sphere, whereas a calyx is going to be less dimensional like a blade of grass. Once you see the two side by side it's pretty hard to mistake one for the other. But yeah that plant is a male.