How to understand knitting P3, yoyo without increasing row count?

by Kathleen
(Point Roberts, WA)

I have a dilemna that I hope you can help me with.

(previous WS row ends with 90 sts)

Then, pattern says:

(RS): k1, sl1 wyifront, k to the last 4 sts, kfb, k3.
(WS): k3, (p3, yoyo) to the last 4 sts, p1, sl1 wyifront, k1, sl1 wyifront.

=91 sts.

When I knit the WS row above (p3, yoyo), this increases the count for the row (more stitches! than 91! I contacted the pattern designer and she said: "The yo-yo gets pulled over 3 sts later, so that might be what's tripping you up with the stitch count."

I don't understand. There isn't anything in the pattern that indicates that the yo-yo gets pulled over later. I've searched YouTube, Googled and found nothing that helps. Maybe this will be a "duh" moment when I find out, but I can't continue the pattern until I understand this. Please, I hope you can help?

Regards,

Kathy