You put yourself at such a high risk every time you have sex without protection, not only for pregnancy but also for STDs. The pull out method does not work, and don't forget there's pre-*** that comes as a risk factor too!
You might not be pregnant, but if you keep on having risky intercourse it'll eventually have an impact.
Pulling out doesn't offer protection, so if you were ovulating you have a 20-25% chance. Unless you're wanting to get pregnant, you condoms at ALL times from start to finish.