Feeling bad

I've been with my fiance for 6 years now. Yesterday we were talking about getting married and having kids. During that he pretty much made it sound like he feels im pressuring him into having a kid. I found out a year ago that i have fertility issues. We have talked about us trying to have a child by the time im 30,currently 25, so we arent ttc right now. My doctor did tell me that it would be best to start trying sooner rather than later given that we know about my issue and that even with medication to help it still may take awhile and to take into consideration of other things that could happen. Our plan before finding out about my issue was to start ttc when i turned 29 and now finding out about it i told my SO that we might want to consider starting in a few years. He said ok but after yesterday i really dont think he is ok with it. I really didnt feel that i was pressuring him but i really do want a child of my own so badly and i dont think he knows that feeling because he already has a child that i absolutely love. Its almost like he doesnt want to talk about having kids anymore ever since we found out about my issue. All i want is to get answers from him so we are both on the same page and i cant and now i feel bad because he feels pressured which wasnt my intention.