Why was Bella Cullen (B. Swan) having those dreams about a boy?

I don't remember quite well because I've only read the boeken once and i havent watched the movies..
but Bella was having dreams of a baby boy and all...
while doing math my thoughts wandered and i remembered how Renesme could toon visions and all..
so the dreams, were they caused door renesme.. well no maybe not..
but what was the whole point of them? so that she could think Nessie is a baby boy? and call him edward jacob junior (which tbvh im glad she isnt)? i mean it can't only be so she could find out she's pregnant..

i think im over thinking... maybe xD

I'm really curious, maybe the auteur was trying to tell us som- OH GOSH IM TURNING INTO MY ENGLISH TEACHER

someone just answer this...