When cycle day 1?/When is a period a period and not spotting?

Hello laddies I have a simple question. When you start spotting is that considered cd1 or do you consider cd1 the first day of flow? When I went to the RE they said the first day of flow is cd1 but I always thought any spotting was considered cd1. Can anyone help me out or at least let me know what you think? Also if  you spot blood for 4 days would that be considered a light period?
Thanxxx

[rghkah38]

I was told that cd1 was full flow and not spotting.  I'm not sure about when you spot for 4 days.  I would call your RE and ask that question.  

[Miranda9]

I, too, was told by my Dr. that thye first day of full flow is CD1.  

Four days of spotting sounds like breakthrough bleeding.  This happened to me this summer - the first time in my life - my ultrasounds in May showed a functional cyst and I didn't ovulate.  My hormones were out of whack for almost 2 months.

I would suggest contacting your Dr. to see what is going on. It's easy to determine through ultrasound and bloodwork.  Good luck:)