Please Help! OPK’s driving me crazy!

I don’t have pictures but I have been doing opk’s the last week to test for LH surge. I have no line at all! 3 days ago there was the faintest line but no where near positive. My predicted ovulation day is Monday 10/9 and am in the middle of my “fertile window”. Has this happened to anyone where there is no line for LH test at all??

Helpful info: I got my IUD removed in the middle of last cycle, but I had my normal period at the normal and predicted time so I figured my body was back on schedule?