I'm married women ttc for 2 years. 1st Ssg done both tube blocked but now Done HSG both tubes opened. But when SSG done my procedure not completed because of their instruments can't open my cervix. D & C done then ssg done again procedure completed but tubes are blocked but now HSG done while procedure there instrument can not go through cervix but she try again then gone inside. So my question is why my cervix always close or they can't open easily. And does sperm goes inside cervix if this problem have or not. How periods come.