I have a scan booked in for 19 weeks 1d, at the moment. But I'd like to delay it by about 10 days, because my husband will be away on the day I booked the scan.

Does anyone know what the window of time is for the ultrasounds they do at that stage? If I have to, I'll go alone, but I know DH will be sad to miss out on seeing the baby and asking questions of the doctor.