Recently married formerly head of household

I recently got married. For several years I’ve claimed 2 on my W-4 and Head of Household when filing my taxes. I’ve always gotten about a $3,000 refund. For this year, my son’s other parent (who I am not married to) will be claiming him and filing Head of Household and I would assume I’ll be filing my taxes Married Filing Jointly. What should I put on my W-4 to avoid having to owe when I file my taxes for this year?