Knitted Circular Scarf

These were my first knitting projects! I was really lucky since I saw that wool, it was really cheap. I started with the rose one. After a couple of weeks wearing it, it got a little longer since I knitted it really loosely... So I decided to make the grey one tighter. Let's see what happens.
Do you have any idea how I can prevent the scarf from lengthening? Or how I can reverse the lengthening?
I created it the way that I can wrap it around my neck two times for a loose fit or three times for when it is rrrrreally c-c-cold out^^
I just love that kind of scarf! When I finished the first one I was afraid it wouldn't keep me warm enough because of the loose knitting, but no problemo!
I don't really know how long it took me... I sat down almost every evening in 7-10 days and knitted while watching TV.
Let me know what you think about it in general =)