US citizen who married a Canadian. First interview at the end of Jan 2017. No contact or updates until last week. Received a letter form G-56 issued to both of us. Reason for appointment is to complete I-130/I-485 processing. Our previous interview went reasonably well. She was a newer officer. Being asked to bring evidence of large purchases (no worries, we bought a truck and home in the last 4 months) taxes for 2016 any insurance documents. My big question is, is this the notice I would receive for a stokes interview? I can't seem to find the answer anywhere. Please help settle my head.