Loose stitches like that are very common and happen to us all to a certain extent. Slipping the first stitch and knitting the last makes for nice edges, but in any case just keep going and it usually sorts itself out.
When asking questions ALWAYS post the name and a link for the pattern if you have it.
Another way to avoid it is to pull extra on the first stitch of the row and to make the next 2-3 a little tighter. They'll be at the end of the next row and that might help to take up some of the extra that `travels' along the row.
this happens to me a lot, i've found that slipping that stitch doesnt really help me. i've found that when you turn the work and knit that first stich, give it a little tug. The tug helps to reduce the size of it... at least for me.
Put it onto your righthand needle without twisting it and without knitting it - just move it over. So put the rh needle through purlwise (in the same direction you do when you purl) and just take the lh needle out of that stitch.