What is the likelihood of pregnancy if withdrawal method used successfully but then reentry occurred within a 15 min time period?

Using the withdrawal method, also known as "pulling out" or "coitus interruptus," does not guarantee complete effectiveness in preventing pregnancy. Although it can reduce the risk of pregnancy compared to unprotected intercourse, it is not a reliable form of contraception.

The exact likelihood of pregnancy after successful withdrawal and subsequent reentry within a 15-minute time frame cannot be determined precisely, as various factors can influence the chances of conception. However, it is essential to understand why the withdrawal method may not be fully effective:

1. Pre-Ejaculatory Fluid: Even before ejaculation, some men may release pre-ejaculatory fluid or precum, which can contain sperm. If this fluid comes into contact with the vagina during intercourse or during reentry, it can potentially lead to pregnancy.

2. Incomplete Withdrawal: Withdrawing the penis before ejaculation may not always be entirely successful, especially in the heat of the moment. If any sperm enters the vagina, even a small amount, it can lead to fertilization.

3. Sperm Survival: Sperm can remain viable and mobile in the female reproductive tract for several days after intercourse. If reentry occurs within a relatively short time, even after successful withdrawal, sperm may still be able to reach and fertilize an egg.

Considering the above factors, the risk of pregnancy after successful withdrawal and reentry within 15 minutes does exist. While the chances may be lower compared to unprotected intercourse, it is not a risk-free method, and alternative contraception methods should be considered for more effective protection against unplanned pregnancy.