There are many ways to detect pregnancy, and one of the most commonly used methods is to determine whether you are pregnant by testing HCG levels in your body. HCG is a hormone produced by the developing embryo and usually appears in the blood within a few days of fertilization.

In addition to testing HCG levels, there are other ways to determine pregnancy. For example, you can observe whether a woman's menstruation comes on time, or you can judge whether a pregnancy reaction occurs by checking a woman's urine.

It's important to note that pregnancy detection methods are not 100% accurate. If any concerns arise, it is recommended to consult a doctor for further examination.