5 weeks into flower and I find pollen sacks

the problem is by the time i noticed them, they already opened and let out pollen. Will my plants grow seeds on them now? or is it to late in flower for the plants to produce seeds?

Five weeks is nothing, sounds like trouble to me. Best bet is to segregate the plant(s) with the pollen from the others and pray it didn't hit them too hard. There is also DutchMasters Reverse. I've never had the need for it but I hear and read it can save crops. Good luck.