Off of the main stem you have the growth of a water leaf and shoot. You can see 2 tiny "flaps" coming from the center of those growths. right there you will see little white hairs grow out called pistils. This is proof of a female. Good luck !
just want to give you some extra verification: No you can't tell the sex just yet...you will know when you see it..white hairs will be in pairs for females at the start and multiply rapidly in most circumstances...for male you will see balls on a stick w/ no hairs
I think i might be seeing pistils, but i cant tell for sure and could very well be wrong. Can we have a few more nodes shots please? that would probally help us figure it out.