After taking three early pregnancy tests with a single bar on the morning of the seventh day after intercourse, it is possible that you are not pregnant, but it is also possible that you have a false negative.
Typically, the earliest time that pregnancy can be detected by an early pregnancy test is about 10 days after conception. Therefore, in general, if you take 3 pregnancy tests after the 7th day of intercourse and find a single bar, it is possible that you are not pregnant, but it is also possible that you are pregnant, but at this time the pregnancy is too short, and the urinary HCG level is too low, resulting in a false negative.
If you want to determine whether you are pregnant or not, you can wait a few days before using test strips, or go to the hospital to improve the blood HCG and other related tests to determine. Before determining your pregnancy, pay attention to the mood of peace, supplement nutrition, pay attention to rest.