Going for a 20 week ultrasound at 16weeks?

Andrea • Mama of 2 girls 💕 and first boy due April 2018 💙

Anyone else have their 20 week ultrasound booked at 16 weeks? I go November 24 for my second ultrasound and I'll only be 16 weeks. But when I am 20weeks, that's around Christmas time. So I'm assuming the clinic is closed around that time. Not sure why they couldn't do it after the holidays.