Hiya hun! Well first off no one can tell you what is right for you. There will be people who will have opinions based around a pro life status and you need a view which is both sides of the coin.
I will tell you this I found myself in a very similar position to you in January of this year. The father wanted me to abort and was quiet the nasty about it. I gave myself a deadline to make my decision and really gave an awful lot of thought to all the pros and the cons of each possible scenario from adoption, abortian, keeping the baby. Everything. Before I even reached my deadline I had made my decision.
The decision I made was to keep this baby and honestly I have never really looked back. I haven't spoken to the father since being two months pregnant. I am now due in 13 days and the anticipation is killing me. I feel that I probably would have come to that decision anyway but i think the way about it gave me confidence in it. And thats really important. I know its not much help but you just have to give it alot of thought and make sure you do what is right for you.