Its only been 8 days. I have filed cases like yours and not received any receipt notice for 3-4 weeks. Be patient. If you get no notice in 3 weeks, call the USCIS customer service. In fact, by coincidence, I filed a marriage adjustment of status packet on that same day, and have not received a receipt notice. I did however mail it with a return receipt so I know that the lock box facitility received it.
Andre Olivie, Esq.
Seattle Immigration Attorney
Sometimes it can take a few weeks to get a receipt notice. If you need to go over your application with an immigration attorney to make sure you did not miss anything, please feel free to give me a call.
Seeta L. Nangia, Esq.
Law Offices of Seeta Nangia
Exclusively Practicing Immigration Law
Phone: (415) 273-9123
Offices located in San Francisco and Berkeley