Can you tell if your pregnant the very next day?

It is not possible to tell if you are pregnant the very next day after unprotected intercourse. The earliest sign of pregnancy is a missed menstrual period, which usually occurs around two to four weeks after ovulation. Some women may experience early pregnancy symptoms, such as fatigue, nausea, and breast tenderness, but these symptoms are not specific to pregnancy and can be caused by other factors. Home pregnancy tests can detect the pregnancy hormone (hCG) in urine, but they are not usually sensitive enough to detect hCG the day after ovulation. Blood tests can detect hCG earlier than urine tests, but they are not as convenient and require a visit to a doctor or lab. The most accurate way to confirm pregnancy is through an ultrasound, which can detect a gestational sac as early as five to six weeks after ovulation.