I've always had light, short AFs, usually 3 days and I conceived at least one boy that I know of. My AFs have been extra light and short lately and it's really worrying me. Like 1 day of light flow. I know my 3 day AFs were just fine, I had a good lining and hormone levels back before they got so light recently. It will be interesting to see the results of my blood work from last month. I'll let you know what they are.
With my normal AF it was unusual for me to go through tampons quickly and often I'd pull a partially dry one out after 12 hours. Usually that would happen on the 3rd/4th and lightest day.