Peak OPK on day AF is due

Latoya

I had the trigger shot on 8/9 ( 16 days ago) I've had high opk (flashing smiley) for the last 4 days including first urine this morning then peak (solid smile) this afternoon. I've been on metformin 1500mg since April and took letrozole 5mg cycle days 3-7. Could the hormones from the different meds, the shot, or my PCOS be causing the peak opk? My hubby's birthday was yesterday so a bfp would be great but I don't want to get my hopes up