17 days of 12/12 and still no sign of sex..

Im growing super haze and have grown the same strain for about 2 years.In previous grows they have shown sex in roughly 10 days give or take.So now its been 17 days and still no sign,the only thing I have done different on this grow is top them after the 5th node,they seem to have taken to it really well.I have no light leaks at all and have vegged for 4 weeks.Has anybody had a plant take longer than this to show sex??
Thanks guys...

47 veiws and no replies,

If you`ve got it on a 12-12 or less light time it will show.Good luck on your grow!!

You try a magnifier at the 4th node? That's usually where I see the first signs.

Thanks guys,I think I will just have to play a waiting game with these suckers..