I want a baby but my SO does not...Advice?

Before my husband and I married we talked about having kids. We don’t use any type of birth control and he always finishes in me. I haven’t gotten pregnant yet and it’s been almost a year, so I assume something must be wrong and I wanted to make a doctors appointment to get checked out. We get into a huge argument because apparently he’s changed his mind. I want kids, always have. If he doesn’t want the same things I do anymore than what’s the point. I love this man with everything in me but I don’t want to give up my opportunity of being a mother. He asked me if I would leave him because he doesn’t want anymore kids(he has two from a previous marriage)...I told him I would. He then goes to say how he wouldn’t mind if we had more. I don’t want to force him into this and I know he’s just saying he doesn’t care now because I said I would leave. I don’t know what to do. Any advice?