Srg - I don't believe much in gender dreams but in my experience it was true. I always dreamed DD was a boy (and really vivid dreams that made me absolutely sure) never dreamed she was a girl. However my mum said she only dreamed that DD was a girl and never a boy.
This pregnancy I've only had one dream and this baby was a girl at the 20 week ultrasound even though we're actually team green. So maybe it means the opposite for me like last time. In saying that my mum had a dream when I was about 8-9 weeks pregnant that I was having a boy this pregnancy and told my atepdad I was having a boy and she was right last time but who knows!!