Do not worry as I have been through similar fashion. My H1B expired August 1st, 2003 and applied for EAD on June 16th, 2003. I went to the BCIS office after 90 days and found out that right on the 90th day, a RFE was issued on the EAD. Waited 10 days for RFE to show up and replied to RFE asap. My Green card got approved on November 19th 2003 and stamping on passport done on December 3rd. On December 1st, 2003, I found out that my EAD got approved (i guess no need for that). My lawyer assured me that I am safe in this scenario (he sent me the law in print). First being in AOS, secondly, one can have an unauthorized employment while AOS for 180 days and since 90 days is the EAD cutoff, getting an interim card after 90 days is still safe. Nevertheless, talk to your lawyer also.