Need advice.

I’m 26 and my boyfriend of 5 years is 29. Well I have been talking to him about having a baby. His response is if it happens it happens. Well I have pcos and endometriosis. I was told it’s going to be extremely hard for me to get pregnant. I keep telling him I would like to go the doc and see what I can do to help get it started or go on birth control and wait awhile. He keeps saying he wants a baby before he’s 30 well that’s in 2 months. How do I get him to be mature and talk to me more about it?