How long do you wait to call dr back for results?

My gyno orderd an ultrasound, to see what going on with my periods. I went on the 8th. I called my gyno office on Wednesday. The nurse said it takes two weeks I told her I was informed by tech that result would be there in 3-4 days. The nurse says okay I am making an note so I can call them tomorrow. I want to call back today to see if they got them. I don't want to be a bug a boo, though I do want know if I can have another child. I really want too. How long would you wait call your Dr back?