How long does a 10000iu pregnyl shot take to leave the system? Info I have says about 12 days. Today I am 9DPO (10dpIUI, 11 days past trigger) and did a test middle of the day to see if it was still in my system and its negative. Is it because its not FMU? I expected it to still be positive at this stage, and was waiting for it to disappear so I'd know Mondays POAS would be reliable, now I am confused!