You are under the age of consent anywhere in Australia
Age of consent laws - Resource Sheet - National Child Protection Clearinghouse
Also there is no close in age defense since he is 4 years older.
Whether your doctor will be required to report this, is unclear, but you will need your parent's permission for the abortion, if its allowed at all.
I'm sorry, this is not what you wanted to hear, but these are the facts. You made the choice to engage in this behavior and now you, your boyfriend and the child will have to deal with the consequences.

