Trigger Shot Question - HELP!

Hi friends, I have a question for all of you who have had trigger shots in the past. How long has the trigger stayed in your system? The first few times I was given a 10,000 iu trigger shot, I used internet cheapies in order to test out the trigger. I started the day after the trigger shot and tested each day until the line disappeared. Each time, I had a negative test by 8 days after the trigger shot. Still, I've read that on average, the rule of thumb is that about 1000 units leave your body per day, so a 10,000 unit shot would take about 10 days to leave your system.

So just out of curiosity, I was wondering if any of you have ever tested out your trigger shots? Have you ever had a false positive as late as 12 days past your trigger shot? I've read on some forums that some women still have enough trigger in their system as late as 13 days past trigger or longer, but I'm wondering how likely that is. I'm not ready to explain exactly why I'm asking, but I would really appreciate any feedback on this!