About now is when your DHT levels should be returning to normal. I would say, now is about the time you should get back on the drug. Another 2 weeks wont kill you but at this point your cause isn't getting any better.
I'm planning on going off propecia for a week pretty soon because I want to cycle it. I'd say being off it for a couple weeks can be beneficial in the long run. Have you noticed any difference in your sexual function since you've been off?