To get an accurate pregnancy test result you should wait up to 2 weeks after trying for a baby.
Or you should wait until the first day of your missed period.
Having a missed period when trying to have a baby is one of the first signs of pregnancy and a missed period usually means that you're pregnant for sure.
A missed period usually happens after two weeks after conception of the baby however some tests may be more sensitive and give you results earlier but as long as you wait two weeks after trying for the baby then the pregnancy test is much more accurate.