Do you believe in dreams becoming real

A while ago I kept having these dreams about me having a baby boy and my boyfriend being unresponsable and not wanting to see him , I had them constantly and 2 weeks later I learned that I was almost 3 months pregnant which ended up as a MC . Last night I had a weird dream about me having a positive pregnancy test again? I am now on BC but had unprotected sex before it Does anyone believe in this? And has it happened to anyone? Could it actual mean something ...