How long does it usually take to detect pregnancy after implantation? Pregnancy is a very important event in many women\’s lives, and many people are concerned about how long it takes to detect pregnancy after implantation. Generally speaking, the secretion and changes of some substances in the body before and after implantation are different. These changes can be used to detect whether the patient is pregnant through some testing methods. So how long does it take to detect pregnancy after implantation? 1. How long does it take to detect pregnancy after conception? conception