Pregnancy can be detected by a blood test for HCG at the hospital gynecology clinic as early as 7 days after intercourse, or by a urine HCG test via an early pregnancy test 14 days after intercourse. Human chorionic gonadotropin is a glycoprotein secreted by placental trophoblast cells. Human chorionic gonadotropin enters the maternal bloodstream and increases rapidly after a woman’s embryo is laid and then remains stable. The fertilized egg runs through the fallopian tube for 3-5 days and then enters the uterine cavity where it lays in the endometrium, completing implantation about 7-10 days after ovulation. It should be noted that women in early pregnancy often experience symptoms such as fatigue, drowsiness, dizziness, early morning nausea or even vomiting, frequent urination, enlarged nipples, darkening of the areola, and elevated basal body temperature, which can help aid in the diagnosis of pregnancy. In addition, women testing for pregnancy must be combined with ultrasound testing to determine if the pregnancy is intrauterine and to eliminate the possibility of ectopic pregnancy.