I would say yes. It will cost you more than it would someone with a big flock, but I like to know if they are in lamb or not and if they are, whether it's a single or multiple birth we're expecting. The scanner that did ours said she could tell singles from multiples reliably but it was hard to reliably tell twins from triplets, as the third foetus is often hidden. If they aren't in lamb they won't need any additional feeding in springtime.
You should get it done soon as additional feed will be needed from six weeks prior to lambing if there are multiple births.