yea do repot .. carefully ..
the "stress" Ppl. will tell you it gets from a repot is more the few days it takes the plant to reach the side of the new pot ..
and even a littel stress here will be mouch better then a rootbound plant in flowering .. that will stress it .. a rootbound plant might only return half the yild .. a repot might cut out a few days of flowering .. so might "Loose" few days .. but nothing close to half the yild ..
and as Somebeech say .. you can do it carefully with next to no stress ..
or do as I did 2 weeks in ..
just cut out the bottom of the old pot carefully and place it in a new pot it fits in with fresh soil in it ..
p.s
in the future .. make it a habbit to repot a weeks before 12/12 ..
now I use a cup for seedlings and a 3 gallon pot for veg. and then a 5 gallon a week before 12/12 ..