Antigen test strips usually do not test for pregnancy, and there are specialized pregnancy test strips and pregnancy tests to detect pregnancy. Antigen test strips measure the body’s antigens, which are usually used for infectious diseases, and are measured by the reaction between antigens and antibodies. However, this is not the case with pregnancy. Hormone levels in the body change during pregnancy, but antigens and antibodies do not. Pregnancy can be determined by measuring morning urine with pregnancy test strips, pregnancy tests, etc. to determine if you are pregnant. If a woman suspects that she is pregnant after having unprotected sex, it is recommended that she consult a doctor in a timely manner, and under the doctor’s guidance, complete the blood hCG test and ultrasound examination to observe whether she is pregnant and whether her pregnancy status is normal.