TORN 😢

My SO and i have been together 8 years, married for 4. We've recently started talking about having a family and he is totally against having kids (when we got married he did want a family, i made sure of that) but in recent events (seeing his brother have a baby) he has changed his mind & says its not going to happen.. he doesnt want the stress of a child, physically or financially. I am heart broken.. we've pretty much out talked the subject.. i know, i just know if we had a child he would see things completely different but he is very cautious and is ALWAYS making sure ive taken my BC pill, he even calls for the refills & pick them up. HELP?!?