I agree with Sunny One
wait till the end of your second week of induction to gauge your progress.
Just because you didnt take measurements before day one doesn't mean you can't benefit from taking measurements now, so write them down to give you an extra way of seeing your losses further along your Atkins journey. Remember Dr Atkins said that 4 weeks without losing weight or inches was a 'stall' and we often lose inches (which = losing FAT) while not losing weight.