New to OPK

CA

I just got off Mirena IUD 2 weeks ago and started charting LH and BBT before getting pregnant again. I started my period 24 hours after removal, the day my period ended I got a peak OPK but had no CM or high BBT. Now a week after my period and supposed positive ovulation, I'm having sticky-EWCM, ovulation type cramps on both ovaries, and just got this OPK this afternoon.

Is one invalid? Or is my body just adjusting to being of BC still? Help lol