I need to know how to find the begninning or end of a row on circular needles. I have been knitting until the sweater I am making is 13.5" long (for my toddler). Now the pattern wants me to k within 3 sts of marker, p6, k to within 3 sts of marker, p6, k to end of round. (This part I understand.) How do I know I’m at the end of the round?