What are the chances I’ll get an anatomy scan?

Last time I saw my doctor was at 18 weeks.

I haven’t had an ultrasound since 6weeks (but nothing but the sac showed so they rescheduled) and then again at 9 weeks (we finally saw the sac and baby).

I see my doctor every 3 weeks so my next appointment will be at 21 weeks. I know most people have their anatomy scan around this time but my doctor didn’t mention anything of it when we scheduled our next appointment. My boyfriend works that day but he said he can take the morning off to be there for the anatomy scan but I don’t want him to have to take off if it’s just gonna a regular check up. My next appointment after this next one would be at 24 weeks so what are the chances this next appointment at 21 weeks will be the anatomy scan?