Welcome!
You’re knitting looks very good and it is becoming more even as you knit. Very nice.
You may be adding the extra sts at the beginnibg of the row. For the knit stitch the yarn is held in back. Be sure to bring the yarn to the back under the needle. If you bribg the yarn to the back over the left needle, that first stitch will look like two sts and your stitch count will increase.