Doppler scan - is it important?

I didn’t get a Doppler scan at my 20 week it was cancelled and they didn’t tell me to reschedule (I had to change the time of my normal scan and she didn’t book in for the Doppler). Should I call to get this booked in or is it not necessary? I didn’t think anything of it until I looked at badger notes. I’m 24 weeks tomorrow. TIA🥰