If you had some spotting you should have no trouble getting the doc to order a bulk billed one (as long as the scan place bulk bills, don't know if they have to). If you do get one at 10 weeks they will be able to give you your due date without any problem then you'll know when you are due to have the NT. Someone in my belly buddy thread went for their first scan only to find out they were 3 weeks further along than she thought so it's well worth checking to make sure you don't miss out on your chance of testing if you want it.