I've finished with a row 4 so I still have a marker on the needle - if I would knit the next 3 stitches to the marker that would be the row 3 and the row 4 would be just 3 the stitches untill one can place the marker. I hope this makes sense?
And yes, I did want to put in a lifeline, but rather after I really finished the first triangle. I was so focussed on doing that, that I didn't realize I could put one now!
I'll try for now to see what happens when I do knit those 3 stitches - I guess all in all it doesn't really matter anyway... It is just 3 stitches over 2 rows, they won't change anything dramatic if they are or aren't knitted...
Here is the picture of the triangle I frogged, just to show what the yarn does for this pattern:
The crochetneedle is there because of the missed knit... I couldn't fix it.