Let it grow if you can handle a few seed, some of my plants made quite a few pollen sacs but compared to the big buds they were on i'd definatly say only a minute percentage of the overall size and if you can pinch of most before the open and spread the pollen then you will limit the amount of seeds produced. The bud will go on to be just fine no matter what but if for say you had two plants in ten and the rest were completly fine and likely to produce no male pollen sacs or seeds then why ruin a good crop for the sake of two plants, in this situation i'd probably chop. Seeds do seem to take a while to develop on the bud so 5 weeks ain't too long and keeping the wind levels in the grow room down to almost zero will stop the airborn spread of pollen around the buds.