1. What are the factors that determine how long it takes to detect pregnancy? How long does it take to detect pregnancy? Actually, many factors need to be considered. First of all, it is related to women\’s own physiological characteristics, such as the length of the menstrual cycle, ovulation time, etc. Secondly, it is also related to the testing method used, such as urine testing, blood testing, B-ultrasound testing, etc. Finally, it is also related to the development of the embryo. Generally speaking, urine testing can be performed about 7-10 days after fertilization. 2. How long does it take for a urine test to detect pregnancy?