The other ladies are right darling, it's absolutely unacceptable what he and his family are doing, he is as responsible as you are but he's not facing up to it, and his mother should be ashamed of herself!
You're a lot stronger than you think, and if you go with what they say then the bullies have won.
You can do whatever you set your mind to, when the baby is here you just find ways to cope, because there's no other option, it just works out somehow.
I really hope that you make a decision that YOU are happy with, right now anyone else's feelings are irrelivent as your bf and his family have acted disgustingly towards you, you deserve a lot better than that xo