My whole family experience messages like that, and like you it seems to come in phases. Sometimes I think our minds are more receptive than other times. My dp is also a non believer but he does get surprised by some of the true dreams in our family.

The hardest part I find is knowing when it IS a message and when it's just a thought....but then I don't think that really matters either...

My sister has dreamt about pregnant people a lot and the sex of their baby etc...she's always been right too.

I have predicted the birth of babies twice (I was doing something else and thought...wow xyz just had the baby).

It's all so unpredictable though....