Why do I keep having a dream every night that I have a child?

I'm 24. Me and my so have been ttc for over 3 years. Here lately I've been having weird dreams. One night I dream that I'm pregnant, the next I dream that I have a little boy and I'm so proud and happy...then I wake up crying. This is weird for me. I do want a child but I'm not obsessed over it to cause dreams such as these. It's very depressing... :(