Thank you to everyone who has responded with your reassuring stories, Alan, your reply especially made me feel better, (coming from a midwife :-), so thank you. I plotted the measurements from her 20 week scan together with these ones and it looks to me like she's stayed on the same growth line, so maybe just always been a little small. Had a scare at ten weeks where the NT was borderline and I think thats just helped in freaking me out. I just wish that once I could go to the doctor and be told "everythings NORMAL and average", but everytime I go it just makes me worried about something else! I'll feel better when I know she's safe and in my arms! Its taken so long to get here that I think I'm just panicked it will all go pear shaped now.