Thank you all so much for the reassurance. I'm in tears reading your lovely words of support.

I have a feeling the mm's are off. My original due date from my LMP was 15th of June but 2 scans changed the date up to the 7th. Plus I put All her measurements in a Online calculator. What I got from that was that she's just a small baby. Plus her head is within the 'Normal' deviation of mm's.

I think I've just taken what the sonographer had said and absolutely freaked!