How many days after the menstrual period is delayed can I take a pregnancy test?

If you have sex during the ovulation period and do not take any contraceptive measures, there is a possibility of pregnancy. On the sixth day after fertilization, trophoblasts begin to secrete a small amount of human chorionic gonadotropin, also known as hCG. On the 10th day after fertilization, it can be detected in the blood cells of the pregnant mother, becoming the most sensitive way to diagnose early pregnancy. You can do an early pregnancy test if your period is delayed for a week. If the test result is positive, it means you are pregnant. In addition, if the menstruation is delayed by one week, a color ultrasound examination can be performed. Generally, the gestational sac can be seen on the ultrasound at 35 days of pregnancy.

Normally, the menstrual cycle is relatively regular, ranging from 28 to 32 days. Generally speaking, if the menstrual period is delayed for more than a week, it can basically be judged by checking the early pregnancy test paper. If you are pregnant, it can usually be clearly shown. However, if the menstruation is irregular and relatively chaotic, the information may not be displayed for more than a week. In this case, if there is a certain probability of error in the test, it can generally be considered to be more than 10-15 days after intercourse and to make a judgment based on the blood HCG test.

The test of blood HCG is the gold standard for clinical diagnosis of pregnancy. It has a relatively high sensitivity and can show up relatively early. Therefore, basic tests can be considered more than 10 days after intercourse. If you are pregnant, it is likely to show up. If you use a pregnancy test stick or early pregnancy test paper to test, generally you need to do a basic test more than 15 days after intercourse before it may show up. If the time is too short, there may be a certain chance of error.

If you have sex after ovulation, you can test for pregnancy as early as 8-10 days. At this time, you can go to the hospital for a blood test to detect changes in human chorionic gonadotropin levels, which can accurately determine whether you are pregnant. This is the earliest and most accurate method to detect early pregnancy. You can also use early pregnancy test strips or pregnancy test sticks to test with morning urine two weeks after having sex. If two red bars appear, it indicates pregnancy. However, this type of testing has certain biases. If B-ultrasound is used for examination, the gestational sac can be detected at the earliest on the 38th day, and pregnancy can also be accurately judged.