Ovulation symptoms but opk is negative

So this morning I did a opk it was dark but probably a hairline lighter than the control line the pic is below. And now I'm having bad mid cycle cramps like I would get every month, I took another 2 more opks and the firstwas lighter than the one this morning, and now it got even lighter, so was this morning my LH surge? We BD this morning before I did the test you think it's enough or should we BD again?