My dental implant fell off the abutment today and actually broke off a chunk of it. I haven't even had it a year!

I'm sorry to hear about your situation! I would recommend seeing your dentist as soon as possible. If it was just the crown/ that fell off, the fix may be as simple as re-cementing it. However, if it truly was the abutment that broke off, there may have been a defect in it. Hopefully the dentist/lab honors their work and replaces it for you. If the implant body is still integrated into your bone and remains stable, there should be no need to replace the implant itself- just the abutment. The process of replacing the abutment (and crown) should take no longer than 2 weeks, but it could likely be rush delivered (by the lab) in a week's time. In the meantime, save the piece(s) that fell off and bring them with you when you see your dentist. Best of luck!

Don't worry about it. This can happen and should be easy to correct or replace altogether. You will not need a new implant so don't worry about. Call your surgeon right away 

If you mean the actual dental implant has fallen off, it means it did not integrate or lost its support. A new implant can be placed once the site has been assessed for bone quality and quantity. Implants require typically 3-4 months of healing before they are ready for the restoration (crown)