Positive opk still cd21

I got a positive opk cd18 but cause I wasn’t testing constantly as I forgot my opks when I went to my partners I came back on cd18 I took a test IG was blazing positive could it had been positive still a day or so before as I wasn’t testing. Now I’m on cd21 and my opk is still blazing positive I’m so confused.

I had heaps of ewcm on cd17-18.

This is what it looks like still now