Keri, I struggled with that same complaint for about the first week or two that I knit. It nearly drove me crazy; I got so tired of having to rip everything out. I’d think I was being unbelievably careful in paying attention to what I was doing, yet I’d still end up with those extra stitches. :wall:
I posted a similar question to yours, and it turns out that I was doing exactly what MrsBear said. I was accidentally wrapping the yarn over (in essence, making an increase) without realizing it. Once I discovered what I’d been doing, it’s only happened to me…maybe once or twice since. It didn’t always happen to me at the beginning of a row, but more often than not, that is when it was occuring. I got into the habit of counting my stitches at the end of every row until I became confident that I was no longer doing this.
Someone here suggested that when beginning to knit a new row, I make sure that my work on the left needle is hanging down and the stitches are all lined up neatly. It made it less likely to accidentally yarn over.