No, it isn’t contagious. Fluids within the blisters won’t spread the rash. The only way another person can get the rash is to be in contact with the resin.
Poison ivy usually lasts 2-3 weeks. During the first week or two, new spots will appear.
The only effective prevention is avoiding contacting with the plant resins. If you feel that you have touched poison ivy, try to wash the skin within the first 15 minutes after being exposed.