Disappointing OB Appointment

Sarah • Army Wife💍 GirlMom💕Expecting baby #3👶🏻

So I went to my routine OBGYN appointment today. I'm 14w5d and I thought the dr was going to do a full body scan of baby to check on the anatomy. Come to find out he isn't doing it until I'm 18-23 weeks along. I originally thought they were supposed to do a scan at about 15 weeks for a skeletal scan and look at the spine. Does that sound unusual at all or is that correct in timing?