hi please help xxx

hi my name is stacey i am 20 years old and have a 19 month old child i have just found out that i am pregnant again and i really do not no what to do with it. my babys father of both the children does not want it he is totally against it. he says we do not need another baby he has got 1 and thats all he needs. please could anybody advise me as what i should do as i do not want to be forst into anything. would some one please give me info aswell as to what would happen if i was to have a abortion thankyou xxx