OPK Testing.. need Advice.

Cassandra 💕

Hi, Does it look like I may have had a possible surge on CD 14. I have had pre ovulation spotting Friday, Saturday and today. Late Friday night I started cramping as well as cramping yesterday along with a low backache as if I was Ovulating. However none of these OPK strips show a true positive/surge for ovulation. Is it possible maybe I missed it. Between 12:30 & 4pm? Maybe my surge is very short. Maybe i have low LH levels. Ugh!! I’m definitely fertile as all the strips are very similar in color since CD 12. I track ovulation through several apps including this one. My expected peak/surge for ovulation should be tomorrow. Should I keep testing?