Blood cannot be drawn 7 days after ovulation, it is too early, and blood can be drawn 10 days later to check for pregnancy.
When women have intercourse during ovulation, fertilization will mostly occur within 24 hours after ovulation, and the fertilized egg will be implanted in the uterus and bedded in 6-7 days after fertilization. Generally, the level of HCG (human chorionic gonadotropin) can be detected in the peripheral blood of the mother’s body in about 1 day after the bedding to determine whether she is pregnant or not, so it is a bit too early for blood sampling on the 7th day of ovulation, and the test can be done after 10 days.
After pregnancy, the HCG level in the body increases gradually with the pregnancy weeks, pregnant women can use morning urine to conduct urine test to detect pregnancy about 2 weeks after intercourse. However, regardless of whether the pregnancy is detected by blood HCG or urine pregnancy test, ultrasound examination is also needed at about 40 days after menopause to clarify the intrauterine pregnancy.