First of all bad-girl, please don't use texting type on this site. It is too hard to read as there are no full stops, capitals, correct spelling and the like.
Secondly, you say this is your boyfriends first offense. Well how could he have had any prior offense? He is far too young. Lets hope this is the first & last time he acts like a complete tw@t showing off in front of his girlfriend & mates in a drunken state.
As for what sort of sentence he is looking at - it's hard to tell. A lot will depend on his behaviour when he appears in front of the judge.
Thirdly, how did you get pregnant? Have you not heard of contraception?