It won't hurt anything to pack it now, like MommyMom2014 said. I so hope you goo full term and have a healthy baby and a safe delivery.
id pack at 30 wks in ur case. i will be packing at 34 weeks
If it makes you feel better, there's no harm in packing your bag now. As you get closer to your due date you can always refresh what you've packed. Or at least have a list ready of what to pack so if you do need your bag early you don't need to start from scratch. Hopefully you go to term! Blessings. :)