Ultrasound is used to determine the presence of ovulation. It may indicate that there is no dominant mature follicle on one ovary, and there is local collapse and a certain amount of fluid in the pelvic cavity, which is due to a small amount of fluid in the pelvic cavity after follicle rupture, which is also an indicator of the presence of ovulation. Some women may also have abdominal pain after ovulation due to fluid accumulation in the pelvic cavity, but such fluid accumulation will end in 3-5 days and will not affect their health. After ovulation, you can arrange another intercourse, the chance of pregnancy will also be mentioned 60% chance, you can buy early pregnancy test paper about 12 days after intercourse to test, first rule out the chance of conception.