LH surge when using after sex urine?

Hey guys, last month I had my surge at CD 19. At CD 12 this month just after sex I took a urine sample and used my opk strip. The test line was pretty much the same color as the control. I thought I'd for sure see a surge the next morning.... nothing. Using clearblue advanced as well and I'm getting flashy smiles. Could it have detected a rise in estrogen in my urine just after sex? Or did I ovulate for a short time and early? Anyone have the same issue? (First photo last opk is the "darker surge" and the second photo is the morning and days after.) (last opk in second photo was taken this morning)