I am pregnant with number 4 and found out the sex as my DD who is now 6 has been longing for a sister (she has 2 younger brothers!)and so I just wanted to prepare her incase I was carrying a boy. I was told it was a girl and saw very clearly for myself the 3 white lines. A few friends have now said that I should not take it as a definate. The sonographer really had a good look to make absolutely sure and she certainly had a very good view as I had told her of my situation with my DD! Could it really be anything other than a little girl?! I always assumed that maybe they got it wrong if they didn't get a very clear view but how can 3 white lines be a boy? I decided not to tell DD as I want to keep it a surprise for her but I was pleased to know as the pressure she was putting me under... "you can always swap with someone else in the hospital...!!" I need reassurance please.