I am either going to book one for at 16 weeks on the 14th August or so, OR try and hold out till 18 weeks and have one on my 24th birthday- though the obvious downside is if I'm disappointed with the result then it's a ruined birthday.
If DP changes his mind about a private scan I will have to wait till 20 weeks on Sept 13th.
SOOO jealous of everyone who is further ahead