I am usually a 28-30 day cycle. The last two month I have been 35 and 36 day cycles. This last one lasted one day and have had brown spotting. I told my doctor and the nurse called back and said she wanted to do a baseline ultrasound tomorrow. I usually only get those to measure my follicoles around ovulation. Why would she order and ultrasound? I'm nervous it could be for not good reasons :/ anyone have any insight?