The second day of coitus there is fluid coming out, this fluid is mostly a mixture of semen and vaginal secretions left after coitus, due to gravity it will flow out, but it does not affect pregnancy. It’s because the amount of sperm in a male ejaculation can reach hundreds of millions of sperm at a time. Even if only a small amount of semen remains in a woman’s reproductive system, there will be a sufficient amount of sperm to enter the uterine cavity. Sperm activity is fast, and it can enter the cervix, the uterine cavity, and continue to move toward the fallopian tubes in a very short period of time, so there is a semen flow after coitus which doesn’t affect the pregnancy either. The key to pregnancy is to choose the ovulation period to have intercourse, can be arranged in the day before ovulation and the day after ovulation, every other day to have intercourse once a way to increase the chances of conception. If you have not had your period sixteen days after intercourse, you can test for pregnancy by using a urine pregnancy test.