I would change to HOH. If you leave it as married and your spouse never worked, you are probably not having enough withheld. You may also want to use the IRS withholding calculator to see if you need to make any additional adjustments on your W-4.
Remember that your tax return treats the entire year using the status on December 31 (single or HOH, in your case), even if you were married for part of the year.
