How long after intercourse can I check for early pregnancy?

Pregnancy can be detected through blood HCG at the earliest 7-10 days after intercourse, and it takes about 14 days to detect urine pregnancy test paper. The detection time is related to the progress of fertilized egg implantation and changes in hormone levels.

Blood HCG testing determines pregnancy by measuring the concentration of chorionic gonadotropin in the blood. The hormone begins to be secreted after the fertilized egg implants, and the concentration reaches the detection threshold in 7-10 days. This method has a high accuracy and can be operated by any hospital laboratory department. Urine pregnancy test strips determine the HCG concentration in the urine. You need to wait for the concentration of the hormone to reach the standard after being metabolized by the kidneys, which usually takes about 14 days. The concentration of hormones in morning urine is higher, so it is recommended to choose morning urine for the first test. Some sensitive test strips claim to be able to test up to 10-12 days in advance, but false negatives may occur due to insufficient hormone concentration. Ultrasound examination needs to wait for the formation of the gestational sac, which usually has diagnostic value more than 20 days after intercourse.

It is recommended to choose a regular medical institution for testing to avoid improper operation or test paper quality problems affecting the results. During pregnancy preparations, you should maintain a regular schedule, avoid smoking and drinking, and supplement folic acid in an appropriate amount. If the test result is positive, a prenatal check-up must be filed in time. If the test result is negative but the menstruation is delayed for more than one week, the test should be repeated. When purchasing pregnancy test strips on your own, be sure to check the expiration date, read the instructions and follow the instructions. If the results are in doubt, you can repeat the test 2-3 days apart.