Women who have regular periods can usually check for pregnancy after sex and a 7-day delay in menstruation; if they have irregular periods, it usually takes longer to check for pregnancy. The earliest symptom of pregnancy is cessation of menstruation, so if a woman who has normal sex and regular menstruation has a delayed period of 7 days or more, she can test her morning urine with a morning pregnancy test strip, and if it shows two lines indicating a positive result, suggesting that she is pregnant. Therefore, pregnancy can be detected after 7 days of delayed menstruation. However, if a woman has irregular periods, it may take longer to detect pregnancy. If a woman has regular periods and has sex and then experiences a delay in her period, she can test with an early pregnancy test.