HPT After Trigger

I have been testing out the trigger with internet cheapies every day since the Ovidrel 250 injection. I am currently 12days past the trigger and 10days past ovulation/IUI. I got the slightest bfp this morning on the cheapie. You have to really really squint to see it. It's the lightest one I have had since testing out the trigger I did the FRER today and got the slightest line. The FRER is more sensitive than the cheapies and the doctor told me today I could start testing for pregnancy because the shot should be out of my system now. Any thoughts as to whether I am actually pregnant or if it's just the trigger lingering? The FRER you can definitely see a very faint line.