When the plant gets a little bigger take a few clones and then force them into flower and the clones will let you know the answer. Takes a few weeks though. That hybrid you have I know real well:) You can tell the sex often by the leaf structure. You and I are the only ones on the planet with these genetics so it can be quite an adventure. The girls will typically produce giant leaves early on (once their finished making the early 3 fingered leaves). In the second or third week you will often see 9 leaflet and even 11 leaflet fans. Also the main fans will have wide leaflets and will be very fat overall. They will sprout and seem small and then every day you look at the plant you'll think the fans grew 2 inches a day.
The boys are more spindly (trunks and stems) and the leaves are narrow and more sativa like. Internodal on the boys is also more sativa like. I have consistently seen this over and over.
Also, in hydro the trunks on the girls will often be 2X in diameter to the boys. The girls also develop these occasional roots that look like main tap roots even though clones never technically have taps. These tap like roots can be as big around as a pencil or even twice the diameter of a pencil.
Watch for these characteristics and see if you can correctly guess the sex before the pre-flowers......Right now its like "What's That? It's Pat?" Oh yeah and this strain shows sex pretty early in veg.
Dee