The first thing to determine is whether you are ovulating at the time of intercourse. If you have intercourse during the non-ovulatory period, the probability of pregnancy is relatively small, and the probability of pregnancy cannot be detected. If you have intercourse during ovulation and you are pregnant after intercourse, the time to determine the specific pregnancy is also different according to different detection methods: 1. Blood HCG test: the best time to check is 7-10 days after intercourse, that is, 7-10 days next month, you can test pregnancy through blood HCG test, the HCG content in women’s body is relatively high at this time, the test results are more accurate and can accurately determine the pregnancy results of women; but some However, in some cases, the elevation of blood HCG will be a few days later; 2. Urine pregnancy test: 17-20 days after intercourse (3-5 days after the delay of menstruation), i.e. 17-20 days of the next month, you can use urine pregnancy test; 3. Ultrasound: if you have regular menstruation, you can check your pregnancy on 35 days (i.e. after the 20th day of the next month) by taking the negative ultrasound test; you can check your pregnancy on 40 days (i.e. after the 25th day of the next month) by taking the abdominal ultrasound test. ) can be detected.