How much time should i avoid sex before taking a pregnancy test?

It doesn't matter...: A pregnancy test works the same way, regardless of whether a woman continues having sex or avoids having sex. That means she doesn't need to avoid having sex. However, if she continues to have sex, a negative pregnancy test means she did not get pregnant over 2-3 weeks ago (but still could be pregnant from recent sex within the last 1-10 days).