Most menstrual periods are delayed by about a week to detect the presence of pregnancy, especially for women with a regular menstrual cycle of about 28-30 days. If the menstrual cycle is very irregular, the time to test for early pregnancy may also be uncertain, but most of them can be inferred by the time of sexual intercourse. You can use early pregnancy test or pregnancy test more than 12 days after the last intercourse, or you can take a blood test for HCG at the hospital 10 days after intercourse to confirm the diagnosis, sometimes you can detect it about 12 days after ovulation, so you don’t need to wait for your period to be delayed. Some women can test almost a week after their period is delayed, and it is relatively accurate at this time.