It is very unlikely that a person could become pregnant from using a towel that has been used to wipe semen. Semen contains sperm, which are needed for pregnancy, but sperm do not live long outside the body. Once semen is dried on a towel, sperm become inactive and cannot cause pregnancy.
If you used the towel to wipe just a small amount of semen from your penis and then used the same towel to clean your girlfriend’s vagina the next day, the chances of pregnancy are extremely low. Sperm generally need to be deposited directly into the vagina during intercourse to have a chance of reaching the egg.
Moreover, even if some sperm were still present on the towel, they would be significantly reduced in number and vitality by the time you used the towel again. For sperm to cause pregnancy, they need to be alive and in significant numbers, and the conditions outside the body are not conducive to this. If you have concerns about pregnancy or sexual health, it’s best to consult a healthcare provider for personalized advice.
It is highly unlikely for pregnancy to occur from using a towel that has been used to wipe semen. Sperm outside the body die quickly and cannot lead to pregnancy.