A Couple Questions, Here

So I'm about four weeks into my grow from clones. The plant has begun to pre-flower and is female. Now that it has begun to pre-flower, does that mean that I HAVE to flower, or can I keep it in veg under 18/6 for a few more weeks? Also, I'm wanting to clone the main lady as I have few seeds which I'm iffy about. Is it possible to clone the plant after pre-flowers have shown, or is it too much stress on the little clone to be put back into full swing veg mode? I'm a bit of a nub at this business, so any feedback is appreciated.

Sure you can keep vegging. Take your clones from it too when it is a little larger. Pre-flowers are present on mature females, and the clones may all have the pre-flowers. Make sure your clones have at least one rooted before sending to flower room.