OPK question

Mary • 37 yrs old and just gave birth to my rainbow baby 2/22/17 after having had 6 losses and I'm expecting again on 2/9/18
took this opk this morn with my 2 morning urine(as i forgot the first), but waited 4hrs. Af ended yesterday and im on a consistent 29 day cycle. I know the test is negative but the color is so close! If the test doesnt get darker over the next few days, does it possibly mean i ovulate while im on Af?