Anatomy scan at 22+5 weeks

My anatomy scan is scheduled for 22+5 weeks at SGH (1 more month). I'm assuming it's because the clinic is full as my doctor did mention he will schedule me for the 20 weeks scan. Is it too late? I tried to call the clinic to check but it seems like the Dr is away this period. Not sure if relevant but I have switched to private route in SGH. #Needadvice #firsttimemom