Usually Implantation occurs 8-10 days after conception/ovulation and normally is not followed by any kind of bleeding. You may be experiencing some kind of vaginal bleeding but how can you be so sure that you are experiencing implantation at the same time?! Implantation can be proven only after it has finished and a pregnancy test becomes positive. There does exist a so called “ovulation bleeding” that may occur during ovulation due to a drop in hormonal levels but “implantation bleeding” is not possible! Implantation does not cause bleeding! You may also be experiencing another type of irregular bleeding that can be caused by many reasons (hormonal, tumor, infection etc.). Usually having sex is not recommended during any kind of vaginal bleeding (including the normal menstrual period) due to the risk of infections. You have to visit a gynecologist if you want to identify the reason for the irregular bleeding you mention.