I want a baby so bad

I keep saying oh it's ok maybe next month but it's not ok. Every time I'm secretly shattered. 
It's all I can think about and people I used to be friends with at school have started families. It just seems so unfair that it's not happened for us yet. After getting over childhood cancer I've been thoroughly checked and despite doctors fears there's no reason anything shouldn't be happening. I was so pleased but now nothing. 
Even walking past the baby aisle in shops gives me a little sting of upset and longing. People don't know we are trying so it's always "oh I'm surprised you guys don't have any yet" or "you better get a move on". All I can do it smile but it hurts 
I just pray this month something happens