Yea i'm pro-choice all the way. We all do irresponsible things. Look at me I was pregnant again when my 1st bubba was 6 weeks old. Though I didn't know for a long time. Though I do think you're being hard on yourself re: failing a child. If you've got Love their really isn't much mroe required.
Obviously you have to talk to him but completely up to you. You seem sensible enough to realise that you are not ready for kids yet and that is a great step. All the best re: this situation.