Did my lh surge start today or yesterday?

So I took an opk yesterday that was pretty close to positive, too close to judge honestly. But I took one in the afternoon and it was negative. Negative with fmu, but got a blazing positive at around 10am.

I assume my surge started today.

Just asking because we couldn't bd last night bc I had terrible cramping. We did bd the night before and we will tonight.

Vote below to see results!