It is definitely possible. I had random bleeding, three times while the twins were nursing, before AF came back for real. The first time was at about four months, when DS was getting supplemented via SNS because of his lousy weight gain, and his nursing decreased sharply in frequency (because the stupid formula was filling him up). The second time was around 10 months, when DD2 nightweaned herself. The third time was at about 13 months old, when I nightweaned DS. But I didn't settle into regular cycles again until they were 16 months.
Each time, it would be totally random-- I'd spot for a few days, maybe go heavy for a half a day, and then it would disappear, and then maybe come back a week later or something, or maybe not for three weeks, or maybe disappear entirely. And each time, after a few "periods" that were obviously not really my regular AF, it would completely go away again.