In this day and age it is rare that they will tell you unless they are totally sure, as they run the risk of being sued. We had three scans and they all said "think it's a girl but can't be 100% sure", decided they said this to protect themselves, however they wouldn't have said it if they weren't pretty sure. Then everyone who had had a boy said "you would know for sure if it was a boy!!" Apparently it's pretty obvious!!
good luck xo