Patient's question:
The baby enters the uterus from the fallopian tube after implantation, or does it implant first and then exit the uterus for blood test to confirm pregnancy, saying it hasn't entered the uterus yet? Menstruation is delayed by 2 days, what is the reason?Doctor's answer:
After sexual intercourse, semen accumulates in the vagina, which contains a large number of sperm. The survival time of sperm is approximately 72 hours. The motile sperm travels through the uterus to the ampulla of the fallopian tube to meet the egg, forming a fertilized egg. The fertilized egg is then transported to the uterine cavity via the fallopian tube and "soars" for 2 to 3 days within the cavity, searching for a suitable landing spot. It then implants and grows in the uterine cavity until full-term delivery. Generally, blood tests 10 days after intercourse can detect HCG levels to determine pregnancy. If menstruation is delayed by 2 days, it may be necessary to wait a bit longer for a more thorough examination.