First IUI need help!

Chylzee
We did our first <a href="https://glowing.com/glow-fertility-program">IUI</a> last Wednesday. I used femara and had one follicle at 23 so they had me do a trigger shot of ovidrel monday night. Went in for <a href="https://glowing.com/glow-fertility-program">IUI</a> wednesday morning. Was very confused on the process or what after it to do. So my main question is... a lot of people say the ovidrel stays in your system for days and you test false positive on a beta from it. Well its four days post <a href="https://glowing.com/glow-fertility-program">iui</a> and i took one to track when the ovidrel is out of my system and its already showing a negative. Is that normal? Or did I do something wrong? So confused and noone to answer my questions.