You may verify this by checking the received date on your I-485 receipt. If it shows 6/29/07, and your PD is Feb 06 EB-2, your 1st 485 may run into problem during its adjudication.
http://blog.wenxuecity.com/blogview.php?date=200708&postID=7089#POBox
http://blog.wenxuecity.com/blogview.php?date=200708&postID=19650#cancelPmt