Well, of course she's pregnant! The piece of scum probably hoped this might keep him out of prison - you can just hear the barrister "He is deeply remorseful, your Honour, and since learning he is to become a father...yada, yada, yada". Trying to defend that piece of shit would surely turn your stomach. The main thing wrong here is that he got off so lightly...should have been six months minimum and the compensation he's been ordered to pay's a joke also.
He's obviously not right in the head, however "drunk" he claims to have been, so good luck to girlfriend. She'll need it.