A negative urine human chorionic gonadotropin, that is, a negative early pregnancy test strip, means that there is no pregnancy, but it may also be that the pregnancy is too short to be detected. If you have intercourse during ovulation without contraception, there is a possibility of pregnancy, but if you use early pregnancy test strips, you can usually wait for a week of delayed menstruation before you can check it out. As long as there are two obvious red lines, pregnancy is basically confirmed. If you want to know if you are pregnant as soon as possible, it is best to go to the hospital to have a blood test for HCG, which is the earliest and most accurate way to determine pregnancy. If you are pregnant, it is best not to stay up late, not to have intercourse, and not to exercise strenuously to avoid miscarriage.