No Christmas BFP

Anna • Had our beautiful miracle June 28th❤️
Well I am out for my BFP on Christmas morning. I posted before about my body telling me I was ovulating with CM and all but my OPK were showing low fertility. I decided to keep taking the OPK and I got my high peak this morning so now my fertility window shifted and my period pushed back till January. My CM is not EWCM so I don't know. Is it possible OPK can be wrong?