gutted

so this is going to sound so pathetic.... but I feel gutted. my partners cousin called him over this morning to tell him his gf was pregnant. They had been trying for 2 months. we have been trying for 18 months and he doesn't seem to understand why this has upset me so much. 1stly I am slightly jealous but trying to be happy for them, 2ndly I just feel crushed that another month has passed and it hasn't happened for me, 3rdly I am terrified there is something wrong with one of us and that it will never be our time and lastly it upsets me so much that my partner doesn't seem to understand why I am so upset. he doesn't realise that every time another friend, relative or stranger happily parades their pregnancy (which they should) it crushes me. I feel like the only thing I really want to happen to me never will. I try so hard not to get consumed by it but I am finding it harder to control my disappointment each month. sorry to go on. Just needed to get this off my chest.