Patient's question:
Last menstrual period was on the 26th, I usually have it earlier, and it hasn't arrived yet today. I'm very nervous. I had sexual contact with my boyfriend on the 11th of this month, and there was withdrawal. Is it accurate to use a pregnancy test now?Doctor's answer:
External ejaculation, with a contraceptive failure rate of over 90%, is mainly due to three reasons, as stated by Guo Zhaohu, a urologist at Beijing Shuguang Hospital: First, during sexual activity, as sexual excitement increases, various glands in the male reproductive system become more active, and secretion fluids along with some seminal vesicle fluid may leak out of the urethral opening and enter the female reproductive tract before ejaculation. This fluid contains a certain number of sperm cells. Second, many men fail to accurately determine the timing of ejaculation, and withdrawing the penis from the vagina too late can easily result in semen remaining in the vagina or at the vaginal opening. Third, semen left around the vaginal opening, on the male penis, or in other parts of the body may enter the female reproductive tract due to other potential reasons.