Will a woman definitely get pregnant after a man ejaculates?

Men do not necessarily cause pregnancy after ejaculation. The probability of pregnancy is higher if intercourse occurs during the ovulation period, while it is lower during the safe period, as no egg is released during this time, making pregnancy unlikely. If sperm lack sufficient motility or speed, they may fail to enter the uterine cavity and fallopian tubes, thus preventing fertilization with the egg, which could also result in no pregnancy. If one does not wish to have a child, it's important to take proper contraceptive measures regularly; using condoms or taking oral contraceptives are effective methods.