About my baby fever... Need advice.

My SO and I have been together almost 3 years. We plan on getting married in the spring. I have two girls already with my ex. He has no children yet. He says he wants to wait. I am 31 and he is 25. I'm afraid that when he is finally ready I won't be able to have children anymore. I had my iud taken out about 6 months ago because it was giving me problems. I told him that I wanted another baby And that if he was against it that is was his decision to wear a condom. He still hasn't used one, he just pulls out. Once in a while he dosnt but it's never around my fertile window. He told a friend of ours that he was ready for a baby. But when I bring it up he just says I'm not ready. How do I convince him otherwise? Is he taking chances on purpose and just not telling me. He also said that if we did get pregnant he would be happy about it.