I also suggest getting them right away.
Several years ago my DD had bilateral cataract surgery. Long story short, my DD almost died because of errors that were made(this was at a major children's hospital in Chicago and the doctor is now chief of staff

) She ended up with a strep-pneumococcal infection
inside of her eyeball that kept breeding and multiplying because the incision had healed shut.
We were in the process of looking for a diagnosis for DD so we always have all of her records sent to her pediatrician (so that we would have them all in one place).
At the time, we were in shock and honestly thought that it was a freak accident that DD got the infection so we continued to see the doctor.
It wasn't until we took DD to see her ENT that he made a comment that caused us to question what happened.
I called the Ped Ophth to request a written prescription for glasses so that we could get some cute ones instead of the ugly ones they gave her in the hospital. I was getting a run-around and no one would call me back. After about 2 weeks of this, the receptionist told me that Dr. M would not give me a prescription because we were negligent parents and never brought DD back for any check ups. She said that the last time Dr M. saw her was the day of the surgery.

I tried to explain to them that was not possible because we had over $100,000 in medical bills from the post-op infection as well as several contact lenses for the undamaged eye. The receptionist said that I needed to take it up with billing because they have no record of any of that.
I promptly called the medical records dept for the doctor as well as the hospital and requested them all to be sent to me. Sure enough, everything was gone!

The operative report for the damaged eye was also changed. Little did any of them know that our pediatrician already had the copies.
In the end, we were not able to collect damages because DD was already disabled so loosing the vision in one eye won't cause a "loss of income".
The really scaring part is that not only did the doctor's office
loose the records, but all of the records from the hospital were
lost as well. On top of all of that, this doctor is now the head of Ophthalmology at this hospital. I always wonder if she still claims never to have a patient suffer from a post-op infection.
For us, it was the anesthesiologist that wanted to cancel the surgery (it was obvious that DD had an upper respiratory infection) but the Ophth insisted that it was not elective and that we had to proceed. (He indicated in his notes that he was against the surgery. Of course, we didn't know the details of this until we read the notes. I'm sure he was covering himself.) She assured us that every precaution would be taken but yet failed to treat the URI with anything other than
moist air for the cough. If the surgery had been postponed (they were 2 days apart instead of at least 2 weeks apart which is standard) or given an antibiotic, she would be able to see out of both eyes and not need to wear a prosthesis.