I have already had 3 scans, have another at 16 weeks and another at 20 weeks. They will be specifically checking for anomalies at these scans.
Due to my history i am grateful for these.
I have told a few select people (immediate family and some who need to know ie my manager as i have a high risk job), but i am planning on telling the majority in 3 weeks after my 16 week scan.