Condoms are pretty effective when used correctly but it would be awesome if you were on both birth control pills AND used condoms. At 16, pregnancy would be a bit of a disaster, I'm sure. How open are your parents to this subject? In the states, we have clinics that underage girls can go to. I would imagine that Australia definitely does as well especially since the system provides for kids finishing high school a year earlier there than in the states and they are off to university younger. You are going to graduate this or next year?