Very very rare your condition, according to my researh.
Your aneurysm is only 1.2 cm, tiny, and does not normally become considered large and dangerous until 5 cm. Which might take 1-5 year or more, depends on many factors.
How fast it grows depend on lifestyle, diet, smoking, soft drink acid, and more.

Blood clot I would be more concerned about. Has your doctor prescribed blood thinning medicine?
What else your doctor say?

I had evar and AAA abdominal aorta aneurysm surgeries last year, and after that also blood clot.
It comes suddenly, and the pain is beyond anything you ever felt in your life. Rush to hospital for emergency surgery, IF one get there fast enough, and depends where the clot is located.

Your doctor is your best source for educated opinion.