How many days after menstruation did a blood test detect pregnancy

Nowadays, there are more and more methods for testing pregnancy, resulting in many women not knowing which product to use to check whether they are really pregnant. You should know that you can only feel at ease if you go to the hospital for a physical examination. Generally, it is a blood test for pregnancy. So let's find out together, how many days can women use hcg to detect pregnancy? How many days after menstruation can blood test detect pregnancy?

How many days can I use hcg to detect pregnancy

Under normal circumstances, it takes a certain amount of time for a woman to become pregnant. Generally speaking, a woman becomes pregnant within 15 to 18 hours after the egg cell is discharged from the female ovary. After the egg is released, it can survive in the woman's body for two days, so having sex after ovulation can increase the chances of pregnancy. However, for a woman to successfully become pregnant after having sex, the following conditions must be met: the man's testicles can produce normal sperm; the woman's ovaries can produce healthy and complete eggs; she has normal sexual life before and after ovulation; her reproductive system is unobstructed; and the extracellular fluid in the uterus is suitable for the implantation and development of the embryo combined with sperm and egg.

The principle of pregnancy test is to detect human chorionic gonadotropin (hCG) in the body's urine. Generally, trophoblasts begin to secrete a small amount of hCG on the 6th day after ovum fertilization, and hCG can be detected in the blood about 1 day later. This is the most sensitive way to detect pregnancy, and the positive hCG reaction in urine will appear later than in blood. Although many pregnancy test strips indicate that women can take a pregnancy test one day after missing their normal menstrual period, in fact, the sensitivity of each pregnancy test strip is different, and the test varies from person to person.

How long does it take to detect pregnancy?

Generally speaking, you can use early pregnancy test strips or pregnancy test sticks to check whether you are pregnant 7-10 days after sexual intercourse. The longer the time interval between sexual intercourse, the more accurate the test result will be. It takes more than 24 hours for male sperm to enter the fallopian tubes and fuse with the egg to form sperm-egg fertilization. With the promotion of microvilli in the fallopian tubes, it takes 6-7 days to reach the uterus. Pregnancy tests can detect whether you are pregnant within one week at the earliest and three weeks at the latest.

The principle of early pregnancy test paper is to determine whether a woman is pregnant by testing the HCG value (the value of human chorionic gonadotropin). Although many early pregnancy test strips indicate that women can test whether they are pregnant one day after their menstrual period is delayed. But in fact, human chorionic gonadotropin is only metabolized by the embryo 10-14 minutes after pregnancy.

In other words, if the test is done too early, the results will be inaccurate because the amount of human chorionic gonadotropin in the body is relatively low at this time. Even if you are already pregnant, it is difficult to detect it with an early pregnancy test.