Worried or no

Would you be worried if you measured totally fine the entire pregnancy and then at 36 weeks you measured 3 weeks behind they sent you for a scan to check to find that baby is small but there is still a margin for error and so they sent you to get a better scan at the hospital which can’t be done for 4 whole days.? I feel like 4 days is too long to wait in case the placenta has stopped working. Would you be worried and want seen sooner than that or should I just roll with it and hope the hospital scheduling department knows what it’s doing.