U/S today

So I just called my doc's office to ask them to call me if they had any u/s cancellations between now and Thursday, as I would be willing to come in early (my doc wanted it scheduled ASAP b/c the earlier the better for dating u/s). Apparently I called at just the right time and they had a cancellation for TODAY at 3:30. Mark is off work (he was on call the whole weekend) so he and sweet P are coming with me!! Wish us luck!! I'm pretty nervous......