I never had migraines before, then had 4 concussions, and then had an ocular migraine. I had the aura combined with the headache which lasted for around a day. I was very scared I would become a migrainer, but it has been 1 year since the ocular migraine and I have not had another. My experience may not mirror yours, but there is a good chance it was a one time occurence, or a rare one.

You should still see a doctor to rule anything else out.