Hurting 😭

So I have been extremely depressed lately my fiance and I have been trying for a baby and he already has a son and I cant seem to get pregnant and its killing me and everytime I see something that has to do with a baby or see my fiances son it makes me extremely depressed because I feel like I cant have my own and I feel horrible for feeling this way and I I try to talk to my fiance about it and he doesn't listen to me I'm literally sitting here crying just asking him to talk to me and help me and he doesn't care and its killing me I cant keep it inside I hate this 😭💔 also I should add that I've had two chemical pregnancies which had been very upsetting to me and he doesnt even act like he cares about that or how it makes me feel