hello mate, it dont work like that, in three weeks of vegg your plants should be big enough, say about 12 inches, when you induce 12/12 it dont stop them from growing, they can still easily achieve 3x there vegg hight, mine are about ten inches when they go into 12/12 they will finish about 3ft 6 to 4ft, go for a grow again mate, if you can get it right then white widow is a monster smoke, they are quite easy to grow as well, i feel for ya cos its quite some time for your next grow to come through, but we all make mistakes, just keep trying all the best!!!!!!!!