I am starting a mermaid tail throw. the pattern reads: Chain 17. Row 1: (right side) Sc in 2nd ch from hook; *skip 4ch, Shell in next ch (shell is 8 dc)skip next 4, sc in next ch; r e[ from * across, turn. (17 Shells) I chained the 17 and did exactly what it said and I only have 2 sets of 8 (2 shells) not 17. What am I doing wrong?