OPK confusion

Hi everyone,

For those who have used OPKs for quite some time, perhaps you can answer:

I used the Clear Blue Digital Advance kit. I started testing a couple of days after my miscarriage bleeding ended (my levels were back down to 0, confirmed by my OB). I had circles for a couple of days and then 4 days of flashing smileys. On Wednesday, I got my static smiley indicating peak fertility. That same day, I tested with a First Response and received a dark pink test line. Great. The two matched up. Here lies my confusion: the FR’s since that day have all been positive. It’s like my LH surge won’t go away. Which test do I believe? It’s hard to pinpoint ovulation because it wasn’t a period, rather a miscarriage, so I struggle to count CD’s.