How long does it take for the gestational sac to swim into the uterine cavity?

When a man's sperm enters a woman's body through sexual intercourse, it cannot reach the woman's uterus directly. Instead, it grows in the woman's uterus after the woman's fallopian tube and the woman's egg combine to form a gestational sac, so that the woman begins to conceive. It takes a while for the gestational sac to reach the uterus, so how long does it take for the gestational sac to swim to the uterine cavity?

1. After sperm enters the vagina, it can survive for 2-3 days. If ovulation occurs during this period, conception will occur. The lifespan of an egg is also about 2-3 days, while it takes one day for sperm to travel from the vagina to the fallopian tube, and two days for the fertilized egg to implant. So the time to conceive after sex should be 21=3 days

2. Pregnancy can only be considered after the fertilized egg successfully implants in the uterus. On the fourth day, the physiological reactions of pregnancy have just begun. The enzyme system during pregnancy has not yet been activated and the metabolites have not yet accumulated. The detection sensitivity of the test paper cannot achieve a clear distinction effect.

3. After 3 weeks, you can use the test paper to judge.

For most women, an ultrasound examination can only detect a gestational sac in the uterine cavity 22 days after having sex. In the situation you described, your last menstrual period was on August 31st, and you had sex on September 18th. If no gestational sac was seen, it is likely that the pregnancy was too short and the embryo was too small. It is recommended that you pay attention to rest in the early stages of pregnancy, maintain a good mood, eat a nutritious diet, eat more fruits and vegetables, and go to the hospital for an ultrasound examination about 7 weeks after your menstruation stops to confirm the pregnancy and check the development of the gestational sac.

Under normal circumstances, the fetus will have a heartbeat at 6 weeks of pregnancy, and the fluctuation of the fetal heart tube can be seen through B-ultrasound. Considering that the actual conception time is late and the pregnancy period is less than 6 weeks, it is recommended to observe and recheck after 7 days.

Under normal circumstances, after the egg and sperm combine, a fertilized egg begins to form, implants in the uterus and begins to develop. The gestational sac is formed based on the development of the fertilized egg. Under normal circumstances, at around 5 weeks of pregnancy, the gestational sac can be observed under B-ultrasound. If it is not implanted in the uterus but in other parts of the body, such as the fallopian tube or abdominal cavity, it is an ectopic pregnancy.