Sock help please!

Hello. I am working on a sock pattern and I am almost done. I am doing the decreases for the toe and i am supposed to do k6 k2 tog all around then 2 rows even and then k6 and k2 tog. I have ended that round but when I get to the last 2 stitches that I am supposed to k together there are 3 stitches. If I just k the 3 tog would that be ok or should I undo a few rows and then do them again

You might have inadvertently added a stitch, but it may not make a difference. A k2tog is going to be a little bulky so end the round with k6, k2tog, k1. On the following dec rounds you’ll still have that extra st at the end. I wouldn’t worry about it, should work out okay.