Use the calculator below. This is the most accurate method.
Figure out out when your embryo adhered to the wall of your uterus.
After implantation, the hormone hCG (human chorionic gonadotropin) will need a bit longer to build up in order for pregnancy tests to detect it. If you are taking a blood test, take it 3-4 days after the date shown. If a urine test is to be taken, do it 4-5 days later.
* Usually occurs 9 days following ovulation, but can range between 6 and 12. Calculations are based on a 9 day average.