U.K. Mums to be advice please

Samantha
Hi ladies, can anyone help me, I put uk moms in the title as I'm not sure if you have the same sorta things over in the us. 
Anyway, I got my 12 week scan through the post today for the 9th March but I still haven't received a booking appointment letter? Do we have booking appointments over here still? I thought we did at about 10 weeks or have any other moms to be had there booking appointment through after the scan appointment? Thanks in advance xx