It took about 2 statements for mine to report also. Hope this helps.
As others stated, Amex takes awhile to report so this is normal. It would be nice if everyone were like Barclay's or Synch in that the accounts report almost immediately.
I opened my account on Jan. 12. My first statement is due next week. Was hoping Amex would start reporting after this due date but it seems like it will be another month.
Thanks - opened mine in Jan as well and was starting to wonder when it would appear.