Counting kicks

Lisa • Mom of 4 boys and one baby girl. Mom of a high-school graduate, preschooler in heaven, 3 year old twins and a 1 year old princess.
I can't remember when my dr said to start counting, not too worried about it bc they move all the time. I never counted kicks with my other babies but this time there are two. When did other twin moms start counting kicks? Should I even give it a second thought?