What should I do??

So I’ve been wanting to have a baby for quite a few months now. My boyfriend and I have been together for a little over 3 years, we have a place of our own, and we both have good jobs enough to support a house hold. I had talked to him about how I’ve been having baby fever for so long and how I really want one. Shortly after I had told him this my sister ended up pregnant with a guy shes been seeing for a few months. She didn’t feel comfortable turning to anyone else but me (my dad can be super judge mental and angry about these things). So being the best I could be I tried to support what ever decision she made. She chose to do an abortion and she went through with it. Honestly I was so mad at her and I know I shouldn’t of been but I just wanted so badly what she had and she took it for granted so I was so upset about it. She had asked me not to tell anyone and it was affecting me so badly that my boyfriend was wondering what was wrong with me so I had told him. And he’s helped me over come it. We have talked about having a baby but he told me he wants to talk more about it in September which is when both of our birthdays are. But every time we have sex he asks if he can finish inside me. (We don’t use any form of protection) so I don’t know if he really wants a baby too or he is just trying to make me feel better? Is it the right thing to do right now? Help.