pruning, is a no no when it comes to flowering, most growers say not to do anything to ur ladies when floweirng, myself on the other hand i pinch and tie them down like crazy. to make them shoot all over the place and contain height issues. but thats not pruning. the only pruning i've ever done to a plant was topping it during veg, and u'll see later tonight or tomorrow in my journal exactly what that does to a science. i have one lady right now with over 20 tops on it. it had over 30 but demised good growth on the plant as an overall. and i also attempted to top one my ladies about 3 day of flower and it flowered fine showed double tops at every point. but it stressed it too much caused it to go hermie on me, and i didn't have my dutchmasters reversal. so i had to cut that out.
so in summary, only prune during veg no matter what day it is, once u hit flowering theres a very small gap in time for u to do any such pruning without forcing ur plant to change its sex. best to let nature do its thing.