OPK and no peak.

Have any of you taken ovulation tests and never had a peak? I thought I did in July on my first round of clomid with the dip sticks (see picture cd18) but this round of 100mg clomid I haven't gotten a solid smiley face/peak fertility. Anybody have that issue and still gotten pregnant? I've heard some women wig pcos never get peak fertility on OPK tests.