How long after sex can I use a test strip to detect pregnancy

For women who are eager to have a baby, they all hope to get the good news as soon as possible. So, how can they know that they are pregnant? How many days during pregnancy can the test be detected? This has to start with the whole process of pregnancy. The only thing we need to know is how to get pregnant quickly and detect the pregnancy quickly if we are pregnant. So how long after intercourse can we detect the pregnancy with a test strip?

How many days does it take for the sperm and egg to implant after intercourse?

4-6 days after fertilization, the sperm and egg have not yet taken root and settled. It floats and swims in the uterus, fully absorbing nutrients and then continues to decompose until it becomes a complete cell-forming embryo with a head and tail. Starting on the 7th day, healthy embryonic cells grow a tail-like drill to drill into the mother's uterine lining, and then develop into the fetal umbilical cord connected to the mother.

On the 7th to 10th day, the embryo finds a suitable and comfortable position on the inner wall of the uterus. Then the small twist drill begins to pierce the mother's uterus and drill inside (embryo implantation). At this time, some mothers will feel a stabbing pain in the lower abdomen from time to time, and there will be a little red blood stain on the underwear, which is the blood flowing from the drilled area. At this time, the small cells can become embryos. They have already differentiated into nearly 100 cells and have begun to secrete the growth-promoting hormone HCG on their own, and the secretion increases with time.

In the absence of pregnancy and under normal circumstances, the amount of HCG is very small, and the standard value detected by blood test is extremely low. However, after the embryo implants, the HCG content in the blood and urine will increase. Therefore, whether you are pregnant can be determined by testing the HCG content in the blood and urine.

How many days after sex can the test be done?

Generally, the result can be detected by testing 7-10 days after sexual intercourse, and the longer the time, the more accurate it is.

This is because, after metabolism, HCG first enters the blood circulation and then enters the urine. If it is a blood test HCG, you can first detect whether you are pregnant about 7 days after intercourse, but if it is a urine HCG test, it usually takes at least 11 to 14 days after intercourse.

Blood HCG testing needs to be carried out in the hospital, and the results are more accurate and have a smaller deviation. Urine HCG is a self-test method using ovulation test strips or pregnancy test sticks, with a success rate of around 75%. If you see a doctor for a scientific urine HCG test, it will be more accurate.

What should you pay attention to when checking HCG?

The HCG blood test does not require fasting. It mainly determines whether a woman is pregnant by accurately measuring the HCG value in her blood.

For urine HCG test, theoretically, urine at any time of the day can be tested, but the first urine in the morning is more accurate because the urine will be diluted after drinking more water.

However, it should be emphasized that many non-pregnancy factors can cause positive urine HCG, such as blood in the urine, uterine ovarian tumors, or taking some fertility drugs, etc., or it may be stimulated by other hormones. Therefore, if you only use urine HCG with quantitative pregnancy test paper to test whether you are pregnant, it cannot be a complete diagnosis. If the urine test is positive for pregnancy, in order to ensure the accuracy of the pregnancy, you should see a doctor in time for blood tests and B-ultrasound examinations for further diagnosis.