On CD 13 I thought that I got a negative OPK result The lines were really close in color, but the test line was a tiny bit lighter. We bd'd that day anyway.

On cd 14, 15, 16 the opks were definitely negative, the line was barely visible.

Now I am afraid that I actually did O on the 13th and we didn't BD on CD 14 and 15.

Last month I got a positive OPK on CD 16 and 17 so it might not have happened yet, but I am worried we missed our chance.