Can't shake the feeling

Lately I've been feeling very sad about this whole process. My husband and I have been trying for a year and a half and it just gets harder and harder. Everywhere I look there are babies or pregnant women and it's hard not to feel sorry for myself.

I have a wonderful life and I'm so thankful for what I have. I'm constantly reminding myself that I should be happy and not so sad. I just can't shake the feeling of sadness and the void.

How do you ladies handle it?