First grow, 5 weeks veg, plant looks small but healthy, any ideas?

So im into the 5th week since i planted 'the doctor' seed, i was just concerned that my plant seemed very small for its container, the plant is 7" tall and the container is easily double that but i have noticed that the roots are at the bottom already, i water every other day but not loads, the burning on the leaves is off the bulb, i think that it seems ready to flower from the little pistils that are coming from the nodes but i am not definately sure. I would like to know whether i could flower now and at least gain something? at this time i can not transplant to a bigger pot so will this be okay if i was to flower now, i am on 18/6 lighting, 2x 45w blue spec and 1x 45w red spec. also in the pics some leaves look drooped, that was from an attempt at super cropping, dont know if that will work either. any help would be great thanks

She's fine

that makes me feel better thanks you reckon i could flower now and gain at least something?

Hmm.
It is small to start flowering..
You wouldn't get that much.
I'd veg another week. When she's ready she'll have what you call 'pre-flowers'..
Which is just her way of telling you she's ready to go into flowering.

But its totally up to you and your space.