My periods are pretty regular (about every 30-35 days). I have been known to skip one or have a very light one maybe once a year. I started spotting Sunday and thought I would for sure start yesterday so I called and made my appointment for my first ultrasound. I explained what was going on to the nurse and she made the appointment anyway, because they are booked, and she didn't want me to miss out this cycle. I still have no flow. Will this cause my IUI to be cancelled? Any info would help. Thanks.