REPORT: Very wrong false positive OPK wrong by 2 weeks

I trusted digital opk tests. They have always been accurate for me. I had 8 low days, 4 high, then a peak. I had stretchy clear CM, so we executed on doing the BD ever 12hrs until we did it 5 times. My period was late so I was certain I was pregnant, several days came back negative, I finally got a BFP on day 11. I was concerned about my HCG so I had it tested the next day. It was a very low 110 but it more then doubled in 48hrs. I was told I most likely ovulated later then I thought. So I searched the internet and only thing I found was that false opk still track your surge but the ovulation can be delayed up until 3-5 more days. Well I just had my first ultrasound and wanted to put it out there that my PEAK opk digital reader was wrong by an entire 2 weeks.