Generally smaller aneurysms, particularly ones that are stable are not likely to rupture. That said, it is also beneficial not to be female, not to smoke and not to have hypertension, because these are factors which influence rupture. Try not to worry.
Where is your aneurysm?
I have an unruptured 8mm aneurysm on the Anterior Communicating Artery. I also have lots of headaches, which require me to take aspirin and lie quietly with an ice pack on my forehead. I am seeing a neurosurgeon this week for a second opinion-he will probably tell me exactly the same thing the first doctor told me last March and will schedule surgery.