I've been noticing some light spotting lately, and with it a significant reduction in milk supply. (DS is five months.) How long should I expect the spotting / decreased supply to last? Milk production was way down all last week, and during pumping sessions at work I could barely get enough for the next day. Monday and Tuesday of this week were great, but then yesterday and today are low again?? I guess I would have thought that supply would be affected one week out of four, just like my period. Any thoughts?