He's moved the goalposts, as others have said, and left you feeling hurt and a bit angry with him.
Don't "do it back to him" by getting pregnant "accidentally on purpose" - makes you no better than him.
Talk to him. Ask him why he doesn't feel ready yet. DH was a bit hesitant about having babies - he didn't like them much, had never had anything to do with them (avoided where possible - saw them as unpredictable shouting things who made mess both ends - fairly accurate, really ). But we were forced into trying really, as I was told I'd never have children and we decided to go down the road of assisted conception, because we knew that we did want children eventually.
And he is the best dad now - very involved, very hands-on, patient, loving, kind - I love watching him with the boys.
So don't make this into a battle. Just find out what's worrying him so much. I don't think it's a terrible thing to wait to have babies or to have them now - but it has to be because you're both happy to, or it could be the end of your marriage.
Good luck with it - and do try counselling if you can't get anywhere just talking to him.