When do i do a pregnancy test if i ovulated on 23rd of january?

If your periods are: regular and approximately monthly, then you could do a pregnancy test as early as February 2, today actually. However, a negative test this soon doesn't mean you aren't pregnant and you would need to do another one 5-7 days later. To increase your chance of an accurate test, use a first morning urine specimen when the urine is most concentrated. Dr. Anne