Those should produce nice little colas.
Depending on the age of the plant when it was put into flower, it can take up to 2 weeks or more to show sex. Wouldn't worry. No the light schedule being 12.5/11.5 won't matter, continue on as nothing happened. If you have a more mature plant in veg say 40 days from seed it will show sex much sooner in flower, but it will also show preflowers in veg.
Took me many years to figure out how to sex in veg, I found growing in smaller containers that plants will show sex faster. Just a trick if you're in a time crunch for sexing plants. You also need good vision or a magnifying glass.
Best of luck.
I flipped them to 12/12 28 days from seed. They have are on Day 11 of flower now. I did tie them down a good bit so they do look quite different. Pics soon.