CD 23 still no positive OPK....

Elise
My fertile week started last Sunday and now I'm on CD 23 with no positive OPK, I've tested every day, sometimes twice a day, and still no positive. I've been taking my BBT and have had no big change either. Anyone else have this problem and still got pregnant? I've very irregular, my cycles have ranged from 23-36 days 😕