It typically takes 14 days for hormonal signs of pregnancy to occur. A woman can find out if she is pregnant by taking a pregnancy test after her period is late, according to About.com. Some early pregnancy tests work before the woman misses her period, but with decreased accuracy.
Pregnancy tests detect the hormone hCG, or human chorionic gonadotropin, in urine, states WebMD. Production of this hormone begins after the fertilized egg implants in the uterus, and levels rise rapidly early in the pregnancy. A woman may also know she is pregnant if she experiences early pregnancy symptoms, such as nausea, frequent urination, fatigue, and cravings or aversions, states Mayo Clinic. These symptoms may begin in the first weeks after conception.