I had it come and go like that, too. It was so gone that I wasn't even wearing a pantyliner (this was around 3 weeks) and then one afternoon I was napping with the boys and all of a sudden - huge bleed (enough that if it continued for more than a few minutes I was calling the midwife!). What a mess! Next morning - gone. That afternoon - big bleed again (was prepared this time!). Happened for a few days that week, then trailed away and haven't seen it since. Weird.