Today is cd 12. i took a clear blue digital opk and it was peak fertility. took a regular opk at 1pm and was negative. which one is correct?

Probably positive: It's hard to be sure, particularly without knowing more about your menses and history. In general, OPK is most reliable when done first thing in the morning on the first void (overnight urine). Later in the afternoon, the urine concentration of LH (the hormonal marker of ovulation) is diluted, dependent on fluid consumption and circadian rhythms in LH. The first test should be more accurate.