it sounds like it's just starting to flower,equinox shouldn't come into it really,your plant is flowering and will continue to do so,it will get bigger during flowering,i've had plants triple in size during flower,especially when they were small when flowering begun,your plant should grow considerably over the next 3-4 weeks then it'll slow height wise,but carry on fattening up,then there's usually a 2nd growth spurt but nothing like the 1st,