Level 1: What is 5 days pregnant? The 5th day of pregnancy refers to the fifth day after the fertilized egg enters the fallopian tube. At this time, the fertilized egg has implanted. Typically, women who are 5 days pregnant do not have any obvious symptoms yet because the embryo has not yet begun to secrete enough human chorionic villi (hCG). Level 2: Can the test be performed at 5 days of pregnancy? Although the embryo has not yet secreted enough hCG at the 5th day of pregnancy, there are some very sensitive ones on the market.