Hey guys i am knitting a sweater for my daughter , first ever !

daughter and sweater that is .
my question is that in the pattern it has a star on the front but on the first row it has k3 in A k1 in B and then k22 in A.
I am just wondering with a chart with that many sts in between th color do i use the same yarn or 2 different strands of B ?
and if ido use the same strand of B do i just stretch it across the wrong side to each st??