Under normal circumstances, it can be detected in about 12 days of intercourse, if it is pregnancy, the test paper will have a dark and a light. Under normal circumstances more than 1 week of menstruation, you can use the morning urine test paper, generally can determine whether the pregnancy, if the menstrual cycle is irregular, you can go to the hospital to draw blood test, intercourse 10 days to draw blood test HCG can determine whether the pregnancy, the fastest is also in intercourse 12 days can be detected. Of course, most of them can be detected only after more than 1 week of menopause. It is recommended to relax, supplement folic acid tablets, pay attention to rest, do not be too nervous, sometimes although the menstruation is delayed, it is suspected that the menstrual disorder is caused by mood and mental tension, it is recommended to let nature take its course, if you are particularly anxious, you can go to the hospital after 10 days of intercourse to have blood test for HCG or test paper to determine whether you are pregnant.