Extra scan at 34 weeks?

Kit
Currently 31 w. At my last appointment my OB GYN, who does an ultrasound at every visit just because that's her thing , told me to make an appointment with my other doctor to get another scan at 34 weeks. He's the one that did our NT scan and Anatomy scan. I have had no problems during the pregnancy and I'm not high risk at all. I forgot to ask her exactly why I needed this other scan and will ask her at my next appointment but I'm wondering if anyone else had an extra one at 34 weeks?