nope.
go ahead and cut that pollen sack off.. and any other that you may see beginning to develop.
you'll be fine dude.. your harvest won't be effected.
oh totally.. a buddie of mine is vegging a flo/blueberry clone thats going in after I chop this one.. will definatley clean everything.Yes and just like 777chronic said, after you harvest you should clean everything up very good just in case, always better to be safe than sorry when it comes to growin that's for-sure