Dude, ter is no chance of her getting preg execept if she has a ano vaginal fistula
which is very very rare, and ter r not many complications to you but your gal may have infections an decreased anal tone leading to fecal leak, and tear of her anal canal
leading to infections, and also introduction of hiv
, hbsag and other notorious infections if not using a condom, remainin is upto u an her. Safe is better.